FWD Audi 8V A3 Catted Downpipe/ VW Golf Mk7 Catted Downpipe 2008 4L BMW F10 550i xDrive

4L BMW F10 550i xDrive N63/TU 4

• Gain up to 15 hp / 15 tq• Improves turbo spool for quicker response• Increases intake & turbo sound• Integrated heat shield keeps intake temps lower• Massive 4" intake pipe for maximum airflow• Perfect for tuned engines & Stage 1 / Stage 2 builds• Supports hybrid & upgraded turbos• SAI filter included for factory compatibility• Easy 45‑minute installation

A tuner comparison on a BMW F10 with N55 engine showed users comparing Doc Vu versus other tuners like David Shoup—highlighting that Doc Vu tunes reliably unlock improved performance

Low Baffle High Capacity: Lower baffles for slightly more fluid capacity

Power gains of up to 40hp to the wheels on a stock vehicle

FWD Audi 8V A3 Catted Downpipe/ VW Golf Mk7 Catted Downpipe 2008 4L BMW F10 550i xDriveHIGHLIGHTS Increased Power and Torque Faster Turbo Spool Improved Exhaust Note PROFILE The ARM Audi A3 Catted Downpipe is an essential upgrade if you're looking to get the most from your Gen 3 EA888 equipped Audi. The stock downpipe is built with a dense catalyst that hinders exhaust flow on your EA888 engine, causing higher back pressure, increasing turbo lag and causing your turbo to work harder. Replacing your OEM downpipe with the ARM A3 Downpipe