The SA-4 head pipe is offered as an option to add to your SA-4 slip on. If you have an existing SA-4 slip on and are looking to add more power and replace your stock head pipe, this is it
TIG welded 304 Stainless steel
Larger diameter than stock allowing more flow
Maximum clearance and seamless fit
Increased horsepower and torque gains
Hand-crafted in the USA
NOTE: Not all models have a corresponding head pipe and are sold as full systems only. Bills Pipes do not manufacture head pipes to fit with any other aftermarket exhaust.