ARM Audi B9 3.0T S4 S5 DownpipeHIGHLIGHTS Increases Power and Torque Massive 6. 5" Design Faster Turbo Spool Improved Exhaust Note Fits OEM and ARM Midpipes Supports Hybrid Turbo Setups PROFILE The ARM B9 S4 Downpipe is one of the best upgrades for the Audi 3. 0T EA839 engine, found in the B9 S4 and S5! The ARM B9 3. 0T Downpipe allows for more exhaust flow from the turbocharger which allows your 3. 0T to spool faster, increasing throttle response, and boosting power and torque. On