Scope of delivery: - Downpipe for Audi A4 A6 1.8T B5 3B 3BG Quattro ø 76mm 3" made of stainless steelDescription: - The downpipe sits between the catalytic converter and the exhaust system. It is bolted to the original catalytic converter or our plug & play 200-cell catalytic converter with item no. 340106 can be used. It has a cross-section of 76mm (original 54mm), an Interlook flex pipe and brackets are installed. The larger downpipe lowers backpressure, relieves the turbo and allows for more power depending on the installed components up to 400HP. The pipe is bent and only welded at the flex section and flange. To connect to the original exhaust system, a reducer sleeve from 76>54mm must be used, but most of the time larger exhaust systems are used when tuning.Suitable for: - Audi A4 1.8T B5 (8E) Quattro 150-180HP - Audi A6 1.8T C5 (4B2, 4B5) Quattro 150-180HPand also for the following upgrade turbochargers: - Borgwarner K04-015 53049880015 - Borgwarner K04-015 / K06 - Borgwarner K04-015 / TFSI compressor wheel50% offer for parts certification: We are looking for someone with an Audi A4 B5 1.8T AJL engine code in the Hamburg area who can make their car available for 4 appointments for a parts certification (ABE) (1-2 hours).1st appointment: Noise measurement in original condition.2nd appointment: Performance measurement in original condition3rd appointment: Noise measurement after installation of downpipe 63.5mm 220154 4th appointment: Performance measurement after installation of downpipe 63.5mm 220154 The downpipe can be installed by yourself or for an additional charge at our partner workshops. If the measurements with the larger downpipe 63.5mm 220154 are within the tolerance range, you will receive a parts certificate according to § 19 (§) StVZO. This allows you to have the downpipe registered without any problems.Registration: For individual approval according to §21 StVZO, please contact your TÜV inspector or our partner company Exclusive-Tuningparts e.K. at https://go-street-legal.com/eintragungsformular/Please note that installing this item is a modification that will void the vehicle's operating license under StVZO. Not permitted for use on public roads.