I will have to differ with you guys. I have the loudmouth system with stock maifolds/cats, just the cat back and its not "too loud". It all depends on opinions. If you drive the car easy, just normal driving, then its not too loud. But when you rip on it it sounds like a nascar. I live in a very yuppie neighborhood and when im driving at 3 a.m. I have no complaints, just keep it under 2k rpms and your fine. Plus it looks the best in my opinion with the 4 tips in the middle.