725350 - Subaru Redline Carbon Fiber Intake

Owned by Brandyn Mowat
Last updated: Jun 01, 2022

725350 - Subaru Redline Carbon Fiber Intake

Subaru WRX STI 2015 - 2021

Subaru WRX STi S209-2019

Subaru WRX STi Type RA-2018




Congratulations on your purchase of the COBB Tuning STI Redline Intake! The following instructions will assist you through the installation process. Please read them BEFORE beginning the install to familiarize yourself with the steps and tools needed. If you feel you cannot properly perform this installation, we HIGHLY recommend you take the vehicle to a qualified and experienced automotive technician.



Table of Contents



Parts List

  • Composite MAF Housing
  • Carbon SF Intake
  • Upper Mounting Bracket
  • Lower Mounting Bracket
  • MAF Housing Adapter Plate
  • Rear Block-Off Plate
  • (2) Retention Pins
  • (2) 7/8" EPDM Grommet
  • (2) 5/8" EPDM Grommet
  • (2) #48 Black Stainless Hose Clamp
  • STI Post MAF Silicone
  • Precut Gasket Sheet
  • 7V2101 Intake Filter
  • 725350-HW Intake Hardware Kit
    • M4 Hex Key
    • M3 Hex Key
    • (5) M6x10mm SS Black Oxide Button Head Bolts
    • (7) M6x16mm SS Black Oxide Button Head Bolts
    • (2) M4x6mm MAF SEnsor 
    • M6x20mm Flange Head Black Oxide Bolt
    • (2) 6mm Lock Washer for

Tools Needed

Sockets

3/8"


Hand Tools




Stock Intake Removal

  1. Remove the (2) plastic retainers that hold down the intake snorkel using a flat head screwdriver.

           


  2. Remove the intake snorkel from the engine bay.




  3. Remove the (2) Phillips head screws holding down the MAF sensor using a Phillips head screwdriver.

             


  4. Gently remove the MAF sensor and unclip the MAF sensor harness then set the sensor somewhere safe.

       


  5. Release the vacuum hoses from the clips on the intake elbow.

       


  6. Loosen the (2) hose clamps on the intake elbow.




  7. Remove the 10mm bolt that holds the bottom of the airbox to the chassis using a 10mm socket and 6" extension.

       


  8. Remove the 10mm nut holding the airbox to the airbox bracket.

       


  9. Gently lift and remove the airbox, being cautious of the other vacuum hoses in the engine bay.

          



Carbon Intake Pre-Assembly

  1. Carefully separate the large ring gasket away from the rest of the gaskets on the pre-cut sheet.  Remove the pieces that are inside of the pre-cut holes.  This can be installed on the large opening of the air filter housing.  Make sure to line up the pre-punched holes with the threaded inserts.




  2. Remove these two pre-cut pieces as well from the gasket sheet.  Remove the sections from the pre-cut holes in the two pieces.




  3. This can be put on the rear block-off plate mounting area.  Make sure to once again line up the holes with the existing threaded parts.  Feel free to put it on straighter than I did.




  4. If you want to put on the rear blockoff plate now is a good time to do so.  Using your supplied 4mm allen key and the three 15mm long allen bolts, screw it in place hand tight.  While it should be hand tight it doesn't need to be insanely tight as overtightening could cause damage.




  5. Take the smaller mounting bracket and pop one of the provided rubber grommets of the larger size into the big opening.




  6. Pop out the pre-cut gasket with the two long slots.  This will get installed onto the same bracket on the side facing away from the bend / Grommet.

        



  7. Like you just did on the smaller bracket, Install the remaining large grommet into the long mounting bracket.




  8. Take the last remaining pre-cut gasket piece.  It should have a single hole in it.  This will attach to the larger mounting bracket.

        


  9. Taking  the two smaller grommets, they can get installed into the hold down points on the snorkel.

        


  10. Grab the supplied round aluminum mounting plate and slip it over the MAF housing with the machined side facing away from the velocity stack




  11. Using 3 of the shorter (10mm) allen bolts along with the 4mm allen wrench provided, screw down the adapter plate to the MAF housing.  The three bolt holes should line up with the threaded inserts  on the three sides that don't have the MAF opening.




  12. Using a 7mm socket or your screwdriver, install the supplied air filter onto the velocity stack.




  13. Install it into the airbox with the MAF opening towards the top side.  Secure it using the 4 remaining Allen Bolts