The problem with the stock Impala exhaust system is that, like most vehicles, it's too restrictive and doesn't allow the engine to reach its full potential. Aftermarket exhaust systems remove these restrictions allowing your vehicle to "breathe better" essentially. AutoAnything provides Chevy Impala accessories and parts from the most trusted and respected names in the industry, so you always get quality, a perfect fit and easy installation. You also get the best deals in the industry from AutoAnything, backed by our one-year lower price guarantee.