CTS Turbo Audi A4 (B9) Test PipeThe CTS B9 A4 2. 0T test pipe is the premier test pipe for your Audi A4 2. 0T. 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, one 02 sensor bung with an option for a second. Substantial power gains, improved exhaust flow and a more throaty sound are the main benefits from
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