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The stock turbo inlet has incorporated additional features (multiple in some cases) that introduce flow restrictions and turbulence while also reducing turbo noises
This direct bolt on downpipe is THE best bang for the buck mod available for your BMW
Ferodo DS2500 Brake Pads
5" straight-through pipe that splits into dual 3" pipes out the back with the valves open
To prevent fuel leaking past the HPFP seal and into the crankcase
AWE Tuning SwitchPath Exhaust | B9 A4 | 2.0L Turbo I4 Color:Chrome Silver The stock turbo inlet hasAWE proudly presents the B9 S4 exhaust solutionsignature AWE tone, performance, and options for every taste and budget. The SwitchPath valved solution gives you complete control of volume and tone at your fingertips. Includes non resonated downpipes, a precision engineered X pipe mid section, and two valved mufflers, controllable via the factory setup or the optional AWE SwitchPath Remote. Sneak out quietly with the valves closed, or open them to
