3,5" 90mm valved catback exhaust system - AUDI RS3 8V CZGB - ECE homologated

The HPerformance 3,5" 90mm downpipe replaces the oringinal factory downpipe. The Factory downpipe comes with a huge restriction on top, directly after the exhaut gas outlet of the turbocharger. As soon as the engine is loaded with more boost, the resulting exhaust gases cannot be handled properly by the stock downpipe. The temperature increases and the back pressure is rising due to the growing mass of exhaust gases. The HPerformance TÜV downpipe replaces the stock front catalysator and has 2 x 400cell catalysators under the car. This downpipe is street legal and can handle up to 850HP. We also offer the option to 2 x 200 cell or 2 x 100 cell as well as a twin decat straight pipe version. Depending on your countries regulations or your own power expectations you can choose your prefered style of catalysator. 

All of our downpipe solutions (400 cell, 200 cell, 100 cell or straight pipe) will offer significant exhaust gas temperature  and backpressure drop compared over the stock downpipe. Also, the sound is more deeptone and backfire will appear by downshifting. The power is increased by removing the stock downpipe to a HP downpipe round about 8-9% over stock. Back pressure reduces around 0,45 bar on stage 2 cars up to 1 bar on stage 3 cars.

Any change on catalysators (replacing, changing cells or size - different than stock) requires software tuning of the engine control unit.

Our TÜV catalysators do not come with TÜV documentations. They just fit the requirements to be legalized in combination with our software and hardware. We can approve them in combination with further hardware & software modifications in house.

The 3,5" 90mm catback exhaust system is designed to handle power levels around 900HP and also offer a great sound, without having negative drone effects in the car. The system comes with a twin 2,75" 70mm pipe diameter, that goes into single 3,5" 90mm. At the smallest section the system offers a 3,5" 90mm diameter, which allows to handle 900HP. It is a plug and play exchange to the stock system, using the stock electric valve. Therefore the system can be controlled by the stock AUDI MMI / Dashboad switches (dynamique / comfort / individual) / auto). The exhaust system can be configured with or without middle silencer. If you choose the "street" option you have the middle silencers, and the system is street legal. The version without middle silencer "race" version does sound more brutal, but has no more homologation.

Please Note:
Any of our items are not deisgned for beeing used street legal. Products that are street legal are marked as such. The offered items are for racing application only and must be installed by professional workshops with corresponding know how. If you want to install the parts on your own, please inform yourself up front, if you are able to handle the installation. You can also ask our technicans on the phone. We cannot take back items that have been incorrectly installed.