The CTS B7 A4 2.0T High Flow Cat Pipe is the premier cat pipe for your 2006-2008 Audi A4 2.0T. \n \nOur high-flow cat is designed to seamlessly fit in place of your restrictive stock catalytic converter, which is situated immediately after the turbocharger.  Our high-flow cat 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 of installing our high-flow cat.  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 A4 owners, our cat pipe is also a very attractive piece.  Each 3" high-flow cat is mandrel-bent, hand tig welded.  Do you need an additional 02 bung for data logging?  Well, that's no problem!  An additional 02 bung is included. \n \nProduct Details: \nT304 stainless steel construction \nMandrel-bent stainless steel \nFully tig welded design \nThird 02 bung (for wideband sensor) included \nInstall hardware included \nGreat power upgrade \n \nFitment: \n \nFitment for factory turbo and CTS-TR-1070 \n2006-2008 Audi A4 2.0T with manual or automatic transmission. It does not fit CVT/Front-wheel drive cars. \nOnly fits LHD vehicles. Fits manual and automatic transmissions, does not fit CVT. \n \nTo remove the CEL that will occur, proper tuning software must be used. The use of stage 2 software upgrade is strongly recommended.