With the initial success of the Gran Sport, Buick added several variants when the 1968 redesign occurred. Now available as the California Gran Sport, Gran Sport 350, Gran Sport 400, and eventually the Gran Sport 455, Buick had a GS for everyone. The top of the line GSX offered more torque and standard equipment than any other muscle car of the era.

The #1 stop for cat-back, axle-back, headers, mufflers, and more! With brands like Flowmaster, Hooker Blackheart, Hooker Classic, Flowtech, Hurst, APR, Dinan and Edge, Holley has the perfect exhaust system for your ride. Whether it is a classic muscle car, late model muscle, sport compact, Jeep, truck, diesel, or European vehicle, we have the exhaust systems available to make your ride stand out from the rest and perform at its best.