Application: Compatible with vehicles or motorcycles with Single exhaust. Will fit for all carbureted engines. Will only fit for vehicles with efi (electronic fuel injection ) that have an 8 or 6 cylinder engine ( will fit for some 4 cylinder efi engines but not always). Will not fit for vehicles or motorcycles with a catalytic converter. Will fit for all carbureted and efi motorcycles with open pipes. 【Part number】Compatible with BFTKAFK-Single 【Application】Will fit for all carbureted engines. Will only fit for vehicles with efi (electronic fuel injection ) that have an 8 or 6 cylinder engine ( will fit for some 4 cylinder efi engines but not always). 【Application】Will not fit for vehicles or motorcycles with a catalytic converter. Will fit for all carbureted and efi motorcycles with open pipes. 【Quality】It is a replacement part with reliable and tested quality 【Service】If you have any questions, please feel free to contact us