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.