Akrapovic Header Pipe - Stainless Steel - Honda CB750 Hornet554026242 Product Description Product Instructions Constructed from high grade stainless steel and provides a 53. 5% (1. 8 kg) weight saving in comparison to the standard stock header Developed with larger diameter tubes to allow improved gas flow with less restriction, the catalytic converter of the stock header is removed to add to the flow When fitted with the Slip On Line (Carbon), power is increased by 1. 6 kW (2. 2 hp) at 9,500 rpm, with a