While some may scoff at the feature being implemented into a "pseudo-M," the M340i/M440i, and the B58 engine platform, are extremely potent and worthy of such a distinction. The factory valance also accommodates the four massive 102mm tips perfectly, further cementing our opinion that the quad tips were destined to be on this performance model. Being numerous and big are not the only selling points to the tips however. Dinan has retained its signature straight cut tip design, safeguarding its unique and elegant styling position amongst a crowded marketplace full of angle cuts. With systems available with either black ceramic coated or polished clamp-on, and laser engraved exhaust tips, there is a version that is sure to meet your individual aesthetic needs.

• 100% 304 stainless steel construction
• 4 lbs lighter than the stock system
• Computer controlled exhaust valves are retained and limit noise during low speed driving and open fully during high-load conditions
• Easy bolt-on installation with included mounting hardware
• Enjoyably louder, sportier sound
• Larger diameter piping for increased flow (76mm vs 70mm)
• More Power: + 6 HP @ 6600 RPM, + 5 LB-FT @ 6600 RPM
• Quad 4" diameter clamp-on, double-walled, polished and laser engraved exhaust tips
• Stock exhaust valve actuator reused and another valve/actuator added to the opposing side promoting even flow regardless of valve position
• Twin exhaust valves are a whopping 76mm diameter, making them 30% less restrictive than the OE valves