Not homologated. AISI 406 stainless steel. Brushed satin ''Works'' finish (The ''Works Finish'' offers true racing vibes with a brushed finish and clearly visible welds). These are racing mufflers which do not comply with regulations. Compatible with both 6-speed Twin Cam and M8 models of mentioned model years. These may not play by the rules but will to let you squeeze out all ponies. So what''s more important; he? But performance is nothing without reliability; therefore this system is free of electronics and valves; crafted from high-grade materials and TIG-welded by hand in Italy. - Deep; bass-rich tone - Aggressive racing sound at high RPM - Enhanced torque and throttle response - Designed in Switzerland – Made in Italy. Note optional heat shields: - 709254Stainless. Brushed satin. Works finish- 709255Stainless. Black Cerakote- 709256Stainless. Polished- 709257Titanium. Brushed satin. Works finish