Ti-6 Pro, Ti-6 and T-6 Exhaust SystemTi-6 AND T-6 4-STROKE EXHAUST SYSTEMSIf you are competing in an AMA Supercross or AMA Motocross series, the Ti-6 Pro titanium exhaust system is perfect for you; created as a full race system, the Ti-6 Pro is designed to increase performance and help professional racers pass AMA/ FIM sound regulationsTi-6 titanium exhaust system is designed to improve performance and power; constructed of titanium throughout the headpipe, mid pipe and canister; this is the ideal exhaust for any offroad or closed course racer looking for improved performance, durability and a professional look; comes with a removable spark arrestor making it easy to alternate between off-road and closed course ridingT-6 stainless steel exhaust system offers the same benefits as Ti-6 titanium exhaust system, but the T-6 is constructed of stainless steel and aluminum for increased strength and durability while giving riders a more affordable alternative to titanium; comes with a removable spark arrestor making it easy to alternate between off-road and closed course ridingAll T-6 Euro exhaust systems pass AMA/ FIM sound regulations Machined aluminum muffler brackets for increased strength and durabilityAsymmetrical muffler configuration for increased packing volumeMost systems equipped with a RC-4 Resonance Chamber for reduced sound outputMachined mid pipe to head pipe joint for a better, leak-free fitTIG precision weldingMost of the Pro Circuit H systems (EURO SYSTEM) don’t have a removable spark arrestor.