Use this MagnaFlow exhaust system when you want to add some excitement to your daily drive or show off at car meets. It's perfect for Nissan Sentra owners who love a sporty sound and better performance. The main piping is 2.25 inches in diameter, and it has 4 - inch polished welded - on double - wall angle - cut rolled - edge tips. It will give your car a moderate exterior and mild interior sound level, making every drive more enjoyable.