If you want subtle, don't get a loudmouth. Magnaflow is loud, and so it flowmaster. Borla is a lot of money, but comes with plates so you can decide how loud you want it. Corsa is another stainless system, but is kinda raspy. I like my Spintech setup. Very quiet until its opened up. I get alot of compliments. Go
www.mufflex-performance.com to hear a sound byte.