Spark Exhaust Technology Yamaha R1 (2015+) "Streetfighter" semi-full exhaust system with Titanium cat-delete link pipe. The half system consists of a titanium de-cat "2-in-1" link pipe for the best performance and keeping to the original header. Handcrafted in Italy. Ultra lightweight 2.5 kg. Dyno Tested for maximum horsepower increase over stock, 102 db. Non-Homologated Racing Version for Maximum Performance.