The CTS Turbo B9 A4/A5/ALLROAD 2.0T high-flow catalytic converter is the premier high-flow cat for your Audi A4/A5/ALLROAD 2.0T.

Their high-flow catalytic converter is designed to fit seamlessly in place of your restrictive stock catalytic converter, which is situated immediately after the turbocharger. They have redesigned their test pipe and high-flow catalyst to both retain the same exterior shape and design for customers wanting to have a stealthy test pipe installed.

Their high flow cat features 3″ stainless steel piping and one 02 sensor bung. Substantial power gains, improved exhaust flow, and a throatier sound are the main benefits of installing the CTS Turbo high-flow catalyst. 

Upon inspection you will notice a flare which is nearly 4″, this flare then tapers to 3″ and is designed to allow for optimal flow as the exhaust gas transitions from the turbocharger to the high flow cat.  In addition to being one of the best bang-for-the-buck performance upgrades for B9 owners, their high-flow catalyst is also a very attractive piece.  Each 3″ test pipe is hand-tig welded.

Kit Contains:

• Does Not Include installation hardware

• Hi-Flow catalytic converter

Note:

• Use of stage 2 software upgrade is strongly recommended.
• To remove the CEL that will occur, proper tuning software must be used.
• DOES NOT FIT 2021+ MODELS WITH V-BAND CONNECTION AT THE TURBOCHARGER