The Spark 2015+ Yamaha R1 GP Titanium Semi-Full Exhaust System features a 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 1.8kg. Dyno Tested for maximum horsepower increase over stock, 113 db. Non-Homologated Racing Version for Maximum Performance.