100% blue proof. The most coveted 2-into-1 performance pipe for Harleys is new and improved with the addition of blue-proof technology over the entire pipe. From its 2-1/8" header and collector heat shields, to its new full coverage megaphone heat shield, Pro Pipe BP carries on the heritage of track proven performance, now with a blue proof chrome finish. Includes mounts for factory O2 Sensors.