True to form, Dinan has developed this Free Flow stainless exhaust to increasing flow by reducing backpressure, 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. This system weighs less than the stock system and is constructed out of stainless steel for the quality and performance you'd expect from your BMW.

• Maximum gain of +6 HP and +5 ft-lb of torque.r
• Durable 20-gauge 304 stainless steel muffler
• Dual 4" (102mm) double-walled, polished or clamp-on black ceramic coated tips with laser engraved Dinan logo.
• Pleasant tone without excessive loudness thanks to Dinan's Tuned Resonance Chamber Technology  Bolt-on installation
•  Bolt-on installation, mounting hardware included

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.