20-24 BMW S1000RR M4 Stainless Steel Header Kit
M4 Stainless Steel Header Kit Features: 304 stainless steel racing header assembly Fits stock muffler, M4 slip-on’s or most aftermarket slip-on’s Saves 12 lbs over stock Big time performance gains equal to or greater than other top exhaust brands Features 3 scavenging equalizer tubes Comes with 4, 18mm O2 bungs and adapters to fit stock sensors GP19 and Tech1 slip-on’s sold separately