Federal Catalytic Converters are not legal for sale, installation or use in the state of California. It should be noted that a split system will often provide an aggressive noise increase, and some designs will split the two pipes to opposite sides of the vehicle. If you are looking to save a little money but still get most of the benefits of a cat back exhaust system, however, aluminized steel may be the way to go. Made from traditional steel that’s been coated on all sides with aluminum-silicon alloy, these systems are very strong thanks to the metallurgical bond which still provides a level of corrosion resistance. While the aluminum coating reflects heat well, the steel can corrode if the aluminum layer is chipped or scraped off. Most cat-back systems will come in either an aluminized or stainless steel version.
They both improve your engine’s tone and give it that deep rumble loved by every motor enthusiast. Getting a cat-back exhaust system is definitely the more budget-friendly option. Other benefits of aluminized steel is they are lightweight and very workable.
Considering cat-back exhausts replace more restrictions, they typically offer increased performance and noise compared to axle-back systems