S4

Unleash the full potential of your 2017+ Audi B9 S4 and S5 3.0T with REDSTAR EXHAUST Downpipes. Designed with a large-bore layout and smooth transitions, these downpipes optimize exhaust flow and efficiency to deliver increased power, sharper throttle response, and a more aggressive exhaust note. With unmatched configuration options, they provide the...

RedStar Exhaust Long Tube Headers are the ultimate upgrade for Audi 3.0 TFSI supercharged engines. Dyno-tested and proven, they deliver an instant 30HP gain and, with proper tuning and supporting mods, can help your Audi reach 500+HP. These headers replace the stock manifold and catted/test pipe section for a seamless fit, improved power, and a more...

Unlock more power with RedStar Exhaust Test Pipes for Audi 3.0 TFSI supercharged engines. These 2.5" high-flow test pipes replace restrictive catalytic converters to improve exhaust flow, throttle response, and overall performance. Built from premium materials and engineered for a direct, precise fit, they’re the perfect upgrade to maximize your Audi’s...