B42405 – VA DIT WRX TMIC

Subaru WRX 2015 - 2021

Congratulations on your purchase of the COBB Tuning VA WRX Top Mount Intercooler! 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

• COBB TMIC Core Assembly
• COBB Thrust Tunnel Back Assembly
• COBB Thrust Tunnel Side Panels
• DIT WRX Bracket Mount
• (2) DIT WRX Power Steering Computer Relocation Bracket
• Silicone TMIC Coupler
• 2.75" - 2.5" Coupler to COBB Charge Pipe
• (2) Prothane Bushings
• (1) Bushing Insert Pin
• 3' Rubber Flap Seal
• 842400-HW Hardware Kit
  • M12 x 1.75mm nylon lock not
  • M12 x 70mm Hex Head Bolt
  • (15) M6x12 SS Black Oxide Button Head Bolt
  • (2) Flanged Hex Nut 6mm
  • (2) #44 Hose Clamps

Tools Needed

Sockets

3/8"

• 3/8" ratchet

• 3/8" 12" extension

• 3/8" 6" extension
  

• 3/8" Socket Swivel

• 3/8" 7mm socket

• 3/8" 10mm socket

• 3/8" 12mm socket 
  

• 3/8" 14mm socket

• 3/8" 17mm socket
• 3/8" 18mm socket

Hand Tools

• Phillips head screwdriver
• Flathead screwdriver
• Trim removal tool

• Pick

Wrenches

• 17mm combination wrench
• 18mm combination wrench

Stock Intercooler Removal

1. Remove the two trim clips from the top corners by pulling out on the center portion using a trim tool or flat-blade screwdriver.
   
       
   
   
   
2. Remove the engine cover by lifting from the back and pulling it towards you at the front.
   
       
   
   
   
3. Remove the 8mm hose clamp securing the factory charge pipe to the passenger's side and pull the pipe free.
   
       
   
   
   
4. Remove the 3 12mm bolts holding the intercooler down at opposite corners.
   
       
   
   
   
5. Remove the driver's side intercooler support bracket.
   
   
   
   
   
6. Gently lift and remove the intercooler from the engine bay.
   
   

Cooling Shround Installation

1. To get to the plastic panels that direct airflow coming in from the hood scoop, we'll first need to remove the underhood insulation.  Using a trim tool pull out the clips holding the insulation in place and set the clips and insulation somewhere safe.
   
       
   
   
   
2. Next up remove the clips holding the plastic ducting to the underside of the hood.  These clips come out a bit more easily than the ones holding the insulation in, you'll just need to gently pry upwards on the center section of the clip until it stops, then gently pry out the lower portion of the clip.  There are two legs that sit inside of the hood on the rear of the ducting, so if you leave the forwardmost clips for last, it should support itself in place most of the time.
   
   
   
   
   
3. The next goal is to remove the soft plastic portion of the ducting.  To do so you'll use a small drill bit to remove the center portion of the plastic rivet so that the top and bottom pieces come free from eachother.  While a bit around 1/8" works the best, make sure to use something smaller than 4mm to avoid making the hole any larger.
   
           
   
   
   
4. To install the new ducting in place, we'll be using an allen bolt and plastic washer on one side, and a steel washer and locking nut on the other side.
   
   
   
   
   
5. Using a 4mm allen wrench and 10mm wrench or socket, install thebottom portion of the ducting with seven towards the "top" with the steel nuts and washers facing outwards.  The two in the bottom corners will be flipped the opposite direction.  While the direction of the fasteners isn't critical, this will make it so that the allen side with the plastic washers is the side visible through the hood scoop or in the engine bay once everything is installed, and avoids the bright hardware catching someone's eye from outside the car.
   
       
   
   
   
6. With the lower ducting portion installed, we can assemble the panel that will replace it.  Set out the base panel that has the sides on it and slide the panel with the COBB logo into it on the inside of the sides.  It should only fit one way.
   
       
   
   
   
7. Use three of your m6 button headed cap screws along with a 4mm allen key to attach each side.  It usually works best to get them all started by hand before you tighten them down.
   
   
   
   
   
8. 
   
   
   
9. Take the provided trim lock and measure and cut out pieces to fit on each face of the duct.  This should provide a better seal against the intercooler.
   
   
   
   
   
10. You can now re-install the shroud and underhood insulation using the factory trim clips.
    
            
    
    

Power Steering Control Module Relocation

1. On the rear passenger's side (USDM) of the vehicle's engine bay.  Locate this control module.  Carefully disconnect the various connectors on it.

   The wires going to the control module are designed to move a significant amount of current.  You MUST disconnect the battery prior to removing these connectors or risk damage to yourself or the vehicle.