Introduction
In this installation guide we have provided step by step instructions to setup, remove the OEM intake system, and install the 27WON Performance Cold Air Intake.
Advisory:
- Working under the vehicle requires a safe and sturdy location for the vehicle to sit on jackstands.
- The engine bay will be hot after recent vehicle operation. Allow the vehicle to cool or use a fan to cool the engine bay before working on the vehicle.
Tools
Parts
- L15 CAI Airbox
- Airbox Lid
- L15 CAI Long Bracket
- L15 CAI Short Bracket
- L15 CAI MAF Housing
- Silicone Coupler - MAF to TIP
- Silicone Coupler - Airbox to MAF
- Air Filter
- T-Bolt Clamp - 67-75mm × 3
- T-Bolt Clamp - 86-94mm
- T-Bolt Clamp - 108-116mm
- Standoff Rubber Isolator - M6x1.0
- SS Hex Head Screw - M5x0.8x12mm × 4
- SS Flange Button Head Screw - M5x0.8x16mm × 4
- SS Flange Nut - M6x1.0
- Rubber Dampener M6x1.0
- SS Hex Head Bolt- M6x1.0x8mm
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First and foremost; THANK YOU for becoming a part of the 27WON Family. We hope to REDEFINE your experience of the aftermarket with the highest level Parts, Customer Service, Packaging, & Support
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Aftermarket transmission coolers may not fit with our intake
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Locate the engine under tray to gain access to the OE lower airbox
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Use 5mm Allen Key to remove the two (2) bolts shown in green circles
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Use 10mm socket & ratchet to remove the seven (7) bolts shown in red circles
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Use a flathead screwdriver to remove the seventeen (17) plastic push-clips. Orange arrows identify the push-clips in described in the next step (3)
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Use large flat head screw driver to remove push-clips on each side of skidtray
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Disconnect the wiring harness from the MAF Sensor
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Remove the wire cover from the airbox
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Use needle noise pliers to pinch the clips then pull the cover off the airbox
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The MAF wire cover consist of two halves that are held together by push lock clips. These will need to be unlocked to remove the cover
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Step 6 will show how to pull apart MAF wire cover
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Using small flathead screwdriver, gently pry between the square loop and the prong, then pry the prong out of the loop
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It takes very little force to insert the flathead screwdriver and pry loose, try not to break the square loop
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With all four prongs unlocked the cover should open as shown
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Pull the wire out of the cover and wrap the exposed section in electrical tape
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Use a small Phillips screwdriver to remove the two screws
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Remove the MAF sensor from the airbox and reinstall the OE screws into the airbox, they are not used in the 27WON CAI
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Base Model MAF Sensor shown, SI MAF Sensor removal is same
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Use a 5.5mm socket to loosen the hose clamp
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A small phillips screwdriver can be used, but is not recommend because the hose clamp head strips easily
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Use a 10mm socket and long extension to unthread the two silver mounting bolts
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You can leave the bolts loose in position during airbox removal
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Pull the hose off the turbo inlet pipe in the direction of the arrow
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With the hose loose, remove the entire airbox from the engine bay
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The result will look as shown in the second image
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From under the vehicle locate the two bolts, use a 10mm socket & ratchet to remove the two bolts
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Remove the lower airbox assembly from the vehicle
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The result will look as shown in the second image
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From under the vehicle, locate lower airbox assembly mounting bracket
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Use a 10mm socket & ratchet to remove the bolt
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Remove the bracket from the vehicle
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The red square shows where the lower inlet of the airbox will sit in the engine bay and fender well
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Locate the provided rubber isolator standoff for step 15
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Locate the provided rubber dampener for step 16
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Locate threaded hole in the core support for manual transmissions
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Locate threaded hole in the core support for Automatic transmissions
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Install the rubber isolator standoff in the threaded hole closest to the turbocharger. Tighten hand tight using your fingers
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There are two threaded holes located in the core support, use the hole closest to the turbocharger. Don't use the hole marked in yellow
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Locate threaded hole in the bracket for manual transmissions
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Locate threaded hole in the bracket for Automatic transmissions
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Install the rubber dampener in the threaded hole found in the bracket, tight hand tight with fingers
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The bracket is mounted to the chassis rail next to the ECU
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Carefully pry the 9 plastic clips open with a flat head screw driver
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Clips are fragile and can easily break if to much force is applied
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Locate the OE Airbox Assembly
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Identify one of the OE rubber mounts and remove the OE bolt (the bolt should be loose in the mount)
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Keep this bolt, it will be used later
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Press the metal collar out of the rubber mount with your hands.
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Pinch the rubber mount together then remove the rubber mount from the OE airbox assembly
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Locate the Long Bracket
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Locate the Short Bracket
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Locate QTY=4 M5x0.8x12mm Hex Head Bolts
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Install the OE rubber mount and steel collar as shown
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Use a 3mm Allen Key to remove the four flanged button head bolts holding the lid on
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Remove the protective cover on the lid and set the lid aside on a non-abrasive surface
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Unwanted scratches could occur if lid is not handled with care
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With the lid removed you now have access to the air filter and the inner airbox mounting location
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Using a 8mm socket and ratchet, install the bracket as shown
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Torque bolts to 24-48 in-lbs
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Locate the OE airbox mounting bolt
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Locate the provided QTY=1 M6x1.0 Flange Nut
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Locate the provided QTY=1 M6x1.0 Hex Head Bolt
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This Clearance warning applies to vehicles with automatic transmissions. Skip step if vehicle has a manual transmission.
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Inside the orange box there are multiple tight clearances due to the CVT.
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Be careful not to run into this sensor. The airbox will clear the sensor but carelessness when inserting the box could damage the sensor
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The bottom of the airbox fits right into this square opening
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In some cars, airbox may touch this sensor. It is ok. Give us a call if this concerns you
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Be careful not to run into the transmission cooler. The airbox will clear the cooler but carelessness when inserting the airbox could damage the airbox
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Aftermarket transmission coolers may not fit with our intake
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Before positioning the 27WON airbox into the engine bay, please identify the correct mounting locations
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Manual transmission inner airbox mounting point
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Manual transmission long bracket mounting point
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Manual transmission short bracket mounting point
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Automatic transmission inner airbox mounting point
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Automatic transmission long bracket mounting point
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Automatic transmission short bracket mounting point
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Lower the 27WON airbox into the engine in the orientation shown.
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Swivel the airbox into position
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Now that the airbox is in position. Attach the provided short bracket to the airbox with (2) M5x0.8X12mm hex head bolts and a 8mm wrench
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Aline the slotted end of the short bracket onto the rubber isolator
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Thread the provided M6x1.0 flange nut onto the rubber isolator. The nut should be loose enough to allow the airbox to still slide within the slotted hole
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Aline the inner hole with the hole in the rubber dampener and insert the provided hex head M6x8mm bolt. Tighten using a 10mm socket with an extension and a ratchet
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Tighten the bolt to 12-24 in-lbs
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Do not over tighten the bolt. This could damage the airbox.
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Aline on the Long bracket with the threaded hole in the chassis
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Insert the OE bolt into the long bracket
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Tighten with a 10mm socket with extension and ratchet, Torque the OE bolt in the long bracket to 36-48 in-lbs
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Tighten the M6x1.0 flange nut on the rubber isolator using a 10mm socket and ratchet to 24-36 in-lbs
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Place the airbox lid onto the airbox
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Install the four M5x0.5x16mm flanged button head bolts, Tighten the bolts to 12 in-lbs
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The lid can crack if significantly over-tightened.
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If the holes in the lid do not want to align exactly with the threaded inserts, you can lightly twist/push the airbox. The mounting process can distort the shape of the bow slightly. This is nothing to worry about
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The MAF housing comes assembled with the necessary MAF sensor installation hardware
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The MAF housing has a small cutout at the top for the wiring harness. This cutout will face the rear of the vehicle once installed
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Silicone coupler between the MAF housing and the OE turbo inlet pipe
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Silicone coupler between the MAF housing and the airbox
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On both silicone couplers there is a "W" logo. The bottom of the "W" will face the front of the vehicle once installed
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Use a 3mm Allen Key to remove the socket cap bolts from the MAF housing
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Install the MAF sensor into the housing
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If you are having issues, push the sensor into the housing while turning the sensor, this should help
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Be careful to not pinch and damage the o-ring on the sensor
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Align the sensor with the stainless steel standoff and install the socket cap bolts
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Torque the socket cap bolts to 24-48 in-lbs
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Locate the provided QTY=1 67-75mm clamps.
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Locate the provided QTY=1 86-94mm clamp
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The 108-116mm clamp is already installed on the air filter
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Verify that your MAF & Silicone Assembly has came as shown
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Install the 67-75mm clamp loose as shown
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Install the 86-94mm clamp loose as shown
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A small gap between the end of the silicone and the MAF housing is normal. This is required for proper connection of the internal step in the silicone
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Angle the MAF & Silicone assembly into the engine bay and onto the airbox
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Verify the silicone coupler connecting to the airbox is over the circumference of the airbox outlet
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Pivot the MAF & Silicone assembly down and onto the turbo inlet pipe
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The silicone coupler is flexible enough to bend and distort as needed to fit over the turbo inlet pipe
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Adjust the silicone coupler to fit around the entrance of the turbo inlet pipe
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If needed, rotate the MAF & Silicone assembly so the MAF sensor and "W" are facing upward as shown
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Use a 10mm wrench or socket and wrench to tighten the 86-94mm clamp on the airbox
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Use a 10mm wrench or socket and wrench to tighten the 67-75mm clamp on the turbo inlet pipe
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Tighten the clamps until snug (the silicone will start to bulge at the edge of the clamp slightly)
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Connect the wiring harness to the MAF sensor as shown
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Check clearance of the clamp at the turbo inlet pipe, verify there is approximately 3/4" clearance from the end of the T-bolt rod to the core support. Rotate clamp to adjust if necessary
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Reinstall radiator fan guard by inserting the 9 plastic clips and pressing down on them with your thumb
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Re-install the 10mm bolts with a 10mm socket & torque wrench. Torque to 8-12 ft-lbs
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Re-install the 5mm socket flange bolts with the 5mm Allen key & torque wrench. Torque to 6-8 ft-lbs
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Re-install the push clips at the bottom of the undertray and the sides (shown in Step 2)
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Re-install the push clips at the side of the undertray
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This completes the installation of your 27WON Performance Cold Air Intake System.
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We hope you were impressed with your 27WON experience and love your new Cold Air Intake for years to come. Email us at sales@27won.com or call us at 571-271-0271 with any questions or concerns
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We recommend going to the next step to learn how to service the air filter or check our video on cleaning the air filter at https://youtu.be/nE7diTeI4Gw
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Please Leave a review here: https://store.27won.com/10th-gen-civic-c...
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Share your experience using #27WON on Instagram and Facebook
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The next step explains how to remove and reinstall your air filter for cleaning and service.
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When re-installing your air filter be careful not to compress the velocity stack on the air box to a point of deformation. Doing so can cause the air box to crack and the air filter to fall off
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Here we show how to remove the air filter for standard maintenence
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Use a 3mm Allen Key to remove the four bolts, then remove the airbox lid
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Use a 10mm socket and wrench to loosen the clamp
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Pull the air filter off the airbox velocity stack then pull the filter straight up and out of the airbox
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The air filter is a tight squeeze to remove, do not worry if the airbox or air filter flex or distorts slightly
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Reinstall the air filter in the reverse order.
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Hold the air filter tight against the airbox velocity stack and tighten the clamp snug. Verify the air filter cannot be pulled loose with a gentle tug
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Verify that the T-bolt rod is not protruded past the top of the airbox, this would damage the airbox lid
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