BRAND NEW DINAN FREE FLOW AXLE-BACK EXHAUST SYSTEM, 304 STAINLESS STEEL, BLACK TIPS, COMPATIBLE WITH 2008-2013 BMW M3 DINAN FREE FLOW AXLE-BACK EXHAUST EMPLOYS LEADING-EDGE TECHNOLOGY TO SOLVE THIS PROBLEM WITH ADVANCED FEATURES NOT FOUND IN MOST AFTERMARKET HIGH-PERFORMANCE EXHAUST SYSTEMS, INCLUDING A HELMHOLTZ CHAMBER & SINGLE-CHANNEL ABSORPTION INCREASES FLOW WHILE REDUCING UNWANTED NOISE & WEIGHT. THE HELMHOLTZ CHAMBER IS A RESONANCE CAVITY THAT REDUCES THE DRONE THAT MOST HIGH-PERFORMANCE EXHAUSTS HAVE AT LIGHT THROTTLE CRUISE. DINAN HAS A STRAIGHT-THROUGH SINGLE PIPE DESIGN TO FURTHER REDUCE NOISE AT LIGHT THROTTLE CRUISE. THE SINGLE-CHANNEL DUAL EXHAUST IS A FULL 10 LBS LIGHTER THAN THE STOCK PART. THE DINAN FREE FLOW AXLE-BACK EXHAUST IS A SPORTY SOUNDING EXHAUST AT WIDE-OPEN THROTTLE WHEN YOU WANT IT BUT ALSO QUITE & CIVILIZED WHEN YOU ARE AT LIGHT THROTTLE CRUISE. BUILT FROM 100% 20 GAUGE-304 STAINLESS STEEL TO RESIST CORROSION. COMPATIBLE WITH: BMW: 2008-2013 M3 FEATURES MORE POWER: + 6 HP @ 6800 RPM, + 5 LB-FT @ 6800 RPM HELMHOLTZ CHMABER TO REMOVE DRONE SINGLE CHANNEL, "STRAIGHT THROUGH" CANISTER DESIGN ENJOYABLY LOUDER, SPORTIER SOUND QUAD 3" BLACK CERAMIC COATED & LASER ENGRAVED EXHAUST TIPS 10 LBS. LIGHTER THAN STOCK 100% 304 STAINLESS STEEL CONSTRUCTION USES THE FACTORY BRACKETS & HANGERS FOR A FACTORY-LIKE FITMENT SPECS: MATERIAL: 304 STAINLESS STEEL MAX HP GAIN: 6 AT 6800 RPM MAX TORQUE (LB-FT) GAIN: 5 AT 6800 RPM PRODUCT TYPE: AXLE-BACK EXHAUST SOUND LEVEL: MODERATE / AGGRESSIVE SYSTEM TYPE: AXLE-BACK YOU CAN VIEW AND DOWNLOAD THE COMPLETE ASSEMBLY INSTRUCTION BOOKLETS FOR THIS EXHAUST SYSTEM HERE.