MAD BMW G8x M3 M4 S58 Resonated Single Midpipe (Brace Included)Introducing the MAD G8x M3 M4 Resonated Single Midpipe, a premium performance upgrade designed to elevate your driving experience to new heights. Crafted from high quality materials and engineered to exacting standards, this midpipe delivers improved exhaust flow and a more aggressive exhaust note. Constructed from durable 304 stainless steel, the MAD Single Midpipe features a single 3. 5'' design that reduces backpressure and enhances engine sound.