The Buick Gran Sport was the apex of performance luxury in its time. When equipped with the legendary 401 cubic inch Nailhead engine, the Gran Sport pumped out 325 hp and a whopping 445 lb/ft of torque. If that doesn't get the job done, we've made dropping in a Gen III/IV LS engine a bolt-in affair.

Holley is home to some of the top-performance exhaust brands in the world. Brands like Flowmaster, Hooker BlackHeart, Hooker Classic, Flowtech, APR, Dinan, and Flowmonster combine to cover thousands of applications and a variety of budgets. Whether you are putting a full stainless steel exhaust on your late-model muscle car or if your rat rod needs a set of Lakester headers, Holley’s exhaust brands have you covered.