CTS Turbo B6 Audi A4 Test Pipe

The CTS B6 A4 1.8T test pipe is the premier test pipe for your B6 Audi A4 1.8T.  Our test pipe is designed to seamlessly fit in place of your restrictive stock catalytic converter, which is situated immediately after the turbocharger.  Our test pipe features 3" stainless steel piping, smooth mandrel bends, two 02 sensor bungs with an option for a third.  Substantial power gains, improved exhaust flow and a more throaty sound are the main benefits from installing our test pipe.  Upon inspection you will notice smooth mandrel bent piping with seamless transitions from the turbocharger to the exhaust system.  In addition to being one of the best bang for the buck performance upgrades for A4 owners our test pipe is also very attractive piece.  Each 3" test pipe is mandrel bent, hand tig welded.  Do you need an additional 02 bung for data logging?  Well that's no problem! Fitment: 2001-2005 B6 Audi A4 1.8T Product Details: T304 stainless steel construction Mandrel bent stainless steel Fully tig welded design Install hardware included Throaty sound Great power upgrade To remove the CEL that will occur, proper tuning software must be used. CTS Turbo recommends choosing a High Flow Cat for the sake of our environment! Use of stage 2 software upgrade is strongly recommended.

This part also goes by the following cross reference.

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Fits These Vehicles 2 applications

A4

Make	Model	Engine	Years
AUDI	A4		2002–2005
AUDI	A4 (B6)		2002–2005

Fitment data last updated: 2026-07-28