AutoAnything has custom fitted exhaust systems for diesel, gasoline and hybrid engines, so regardless of what your Regal came with, or what you've put in there since, we have the aftermarket exhaust components which will fit your engine perfectly. All of our Buick accessories and parts also come with AutoAnything's 1-year lower price guarantee and free shipping, so you'll always get the best parts at the lowest prices whenever you shop at AutoAnything.