True to form, Dinan has developed this Free Flow stainless exhaust to increasing flow by reducing back pressure, resulting in more power. Best of all, it has a great tone that is aggressive when you want it to be, but pleasant and civilized under normal driving conditions. Constructed from stainless steel for the quality and performance you'd expect from your BMW.

• More Power: +8 HP @ 6600 RPM, +6 FT-LB @ 6600 RPM.
• Enjoyably louder, sportier sound
• Quad 4.5" (114mm) diameter clamp-on, double-walled, black ceramic coated and laser engraved exhaust tips.
• Tuck-it tip design ensures a nearly flawless and unencumbered visual appearance.
• 100% 304 brushed stainless steel construction w/ TIG welding.
• Larger diameter piping for increased flow (76mm vs 70mm).
• 5 lbs lighter than the stock system.
• Computer controlled exhaust valves retained, limiting noise during low speed driving and opening fully during high-load conditions.
• Twin exhaust valves are a whopping 76mm diameter, making them 30% less restrictive than the OE valves.
• Easy bolt-on installation with included mounting hardware.

For over 35 years, Dinan has been America's premier tuning company, pioneering advancements in BMW modification while retaining a focus on balanced performance that preserves the original character and driving feel that a BMW offers. When you install a Dinan part on your car, know that it's not only carefully developed and tested, but that Dinan stands behind it with a four year, 50,000-mile warranty. Dinan believes so fully in their “total package” approach that once your car has been fitted with enough of their parts, they celebrate your conversion from stock to Dinan with an exclusive trunk badge, displayed proudly by BMW enthusiasts everywhere.