Exhaust System - No Silencer Fits: BMW M 1000 RR 2022, 2023 and 2024 models. TIG welded by hand for smoother internal surface (reduces internal turbulence, improves gas flow). Healtech electronic valve eliminator included with the kit. See kit photo for included parts. Modern spring fit design allows for fewer internal welds. The downpipes weigh in at a featherweight 4kg / 8.8lbs (original exhaust 8kg / 17.6lbs). Saving half the weight. Accepts original Lambda sensors (O2 sensors). Fitting instruction sheet included. Designed to fit a silencer with a 51.5mm/2 inch internal diameter, including our own Black Widow silencers 2 Year Black Widow Unlimited Mileage Warranty.