This exhaust is great for Volkswagen Jetta GLI owners who want to enhance their car's performance. Whether you're daily driving or hitting the track, it'll make a difference. It's made of T304 stainless steel, which is super durable. The tubing is 3 inches in diameter and mandrel bent for better exhaust flow. If you love your car and want it to perform at its best, this exhaust is for you.