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96-05 (B5 & B6) Audi A4 & 98-05 (B5) VW Passat 1.8T Test Pipe INSTALLATION GUIDE

Tools Needed:

12mm Wrench and Deep/Medium Socket

13mm Wrench and Deep/Medium Socket

17mm Wrench and Deep/Medium Socket

Multiple lengths/quantities of socket extensions.

Swivel.

Optional:

Friend (makes install a lot easier)

Install Time: 1-2 hours

Difficulty (1 Easy, 5 Hard): 2

Removal

  1. Let the car cool down completely. 
  2. Jack up car and put on jack stands.

Engine Bay:

  1. (Optional) Remove the stock airbox (if still using) for more room.
  2. Remove the front and rear o2 sensors.
  3. Unscrew the top 2 nuts (17mm) on the turbo outlet/catalytic converter inlet flanges.
  4. (Optional)  If you cannot remove your downpipe easily, unbolt the top 2 bolt/nuts (12mm, long extension, and swivel) on the catalytic converter outlet/downpipe inlet flanges.  If you have a friend, have them go underneath the car and hold the nut/bolt on the back side with a 12mm wrench.

Underneath the car:

  1. Unscrew the bottom nut (17mm, long extension, and swivel) on the turbo outlet/catalytic converter inlet flanges.
  2. Unbolt the downpipe from the exhaust system. 
  3. (Optional) Unbolt the bottom bolt/nuts (12mm socket and wrench) on the catalytic converter outlet/downpipe inlet flanges.  Use a wrench to hold one side while you unbolt the nut/bolt.
  4. Remove the catalytic converter while still attached to the downpipe (or remove the catalytic converter alone if downpipe cannot be removed easily).  On slip-fit joints (OEM)

Installation

Engine Bay:

  1. Attach the test pipe to the downpipe off the car.  Then install both units together (or install test pipe alone if downpipe is not removed).
  2. Tighten the top 2 nuts (17mm) on the turbo outlet/catalytic converter inlet flanges using the supplied stainless steel nut and stainless steel lock washer. 
  3. (Optional) Bolt the top 2 bolt/nuts (13mm, long extension, and swivel) on the catalytic converter outlet/downpipe inlet flanges using the supplied stainless steel nuts, bolts, and stainless steel lock washer.  If you have a friend, have them go underneath the car and hold the nut/bolt on the back side with a 13mm wrench. 
  4. Reinstall the front and rear o2 sensors.
  5. Reinstall the stock airbox if removed.

Underneath the car:

  1. Tighten the bottom nut (17mm, long extension, and swivel) on the turbo outlet/catalytic converter inlet flanges using the supplied stainless steel nut.  Due to the larger size (3”) piping, it is difficult to get a deep socket on the nut.  Use a medium socket or use a wrench from underneath the turbo to tighten.
  2. Tighten the downpipe to the exhaust system if removed. 
  3. (Optional) Bolt the bottom bolt/nuts (13mm socket and wrench) on the catalytic converter outlet/downpipe inlet flanges using the supplied stainless steel nuts, bolts, and stainless steel lock washer. Use a wrench to hold one side while you tighten the nut/bolt.
  4. Put the car on the ground and enjoy!

If there are any problems or questions about installation, please contact us at contact@evolutionracewerks.com or (626) 814-3403.