In terms of pure performance, the Buick Regal probably doesn't rank highly on most people's list. However, it was built on the versatile G-Body platform which allows for various engine swaps and a litany of performance parts to bolt right in. GM knew this too as the humble Regal was the base for the legendary Buick Grand National.

Absorption and Glass Pack style mufflers are available in several brands with dozens of inlet/outlet size combinations