034Motorsport High-Flow Catalytic Converters are designed to replace the restrictive factory catalytic converter, and allow for quicker spool while increasing horsepower and torque throughout the powerband.
*** MOTORSPORT USE ONLY - MAY NOT PASS A UK MOT EMISSIONS TEST ***
We construct them from stainless steel tubing, and utilize a high-performance 250-cell stainless-steel-matrix cat. They feature precision flanges to prevent warping and expansion, factory-correct exhaust hanger location, and 2 oxygen sensor bungs in the proper locations for the factory sensors. Full 3" tubing is used throughout.
Complete drop-in upgrade; will bolt up to any stock/stock-fit turbo and stock/stock-fit exhaust. Professionally assembled in-house, TIG-welded.
Features:
Stainless Steel Tubing
TIG Welded
Application-Specific Flanges
Factory Oxygen Sensor and Exhaust Hanger Placement
Installation Hardware Included!
Dyno-Proven Horsepower and Torque Gains!
We've seen gains of over 27WTQ and 33WHP on our dyno on stock turbo tunes.
Fitment:
 
2005.5 - 2008 Audi A4 2.0T (B7)

NOTES: 
Whilst most cars won't be affected, it is possible that an engine light will occur after installation due to the catalyst element in this being a higher flow rate than the standard one.