Aprilia RSV4 2009-2014 GPR Exhaust Systems Thunder Slash Race Line Slipon Muffler Race line open Thunder stainless steel silencer weighs only 1.6 Kg approximate. Made in Italy from durable Aisi 304 Stainless Steel, using advanced TIG welding. All mounting hardware included for a perfect fitment. Joints\ mid pipes included where applicable. No modification needed. Designed and Dyno-tested in GPR's factory. The GPR design proves successful in performance and sound. Allows better gas outflow and increase in horsepower and acceleration.Includes GPR's 2 years warranty.