Restrictive, Hot, Quiet…all common complaints about stock head pipes. Resolve all 3 issues with Firebrand’s Smoothbore Headers! Engineered to fit under stock heatshields, Smoothbore Header’s open collector design eliminates the congestion and allows your bike to breathe like it was born to. And by utilizing your stock heatshields, you get all the benefits of a free flowing header system without breaking the bank.