Spark Exhaust Technology Triumph Trident 660 "GP" full exhaust system. Constructed with a GP style silencer, special racing catalyst to the pre-silencer box, heat shield and stainless steel header. The system is the result of months of R&D work derived from Moto2 World Championship Racing. Spark full system improves performance by 4.6hp @ 9,853rpm and gives the motorcycle a dark and enveloping sound as well as a unique design. Handcrafted in Italy. Ultra lightweight approximately 5kg. Dyno Tested for maximum horsepower increase over stock. Racing Version for Maximum Performance. For perfect performance, throttle response and durability, ECU remapping is recommended. *Does not include removable DB Killer.