Reduce back pressure and restore performance and acceleration lost due to a faulty muffler!
For 1970-on BMW cycles (exc. R45 and R65)
Reverse-cone mufflers made of chromed cold-rolled, heavy-gauge carbon steel. Mechanical metal baffle core never needs replacement. Welded-on mounting tab. Slip on over existing original size and style exhaust pipes only. Measure outside diameter before ordering. Use original mounting hardware, clamps and brackets to install.