FREEFLOW EXHAUST; G8X M3/M4

The Dinan Valved Axle-Back Exhaust system addresses the sound shortcomings of the G8x M3/M4 platform. The stock exhaust, while an improvement over its predecessor, still has too much rasp. Dinan's system provides a deeper, sportier, and more aggressive tone, with increased amplification. When combined with the optional middle exhaust/x-pipe, it delivers an even louder, smoother, and fuller sound.

Extensive development was done to create a system that sounds superb externally and avoids excessive cabin drone on both sedan and coupe body types of the G8x chassis. The tubing is enlarged to 76mm (from 70mm stock) for freer flow and reduced backpressure. The system retains the factory exhaust valves, which direct flow into the Dinan muffler for a subdued note at low speeds, or bypass the muffler for a near straight-pipe design and maximum sound during high-load conditions.

The exhaust is crafted from T304 stainless steel and TIG welded, with a brush finish for an immaculate appearance. It features massive, quad 4.5-inch (114mm) clamp-on, double-walled, black ceramic coated tips with a laser-engraved Dinan logo. These tips seamlessly fill the factory cut-outs for an OEM+ look with an aggressive sound.