And that's based on what? (Flowmasters are too restrictive ) , there is more to a muffler than air flow , You have a 10sec street car that you changed mufflers and it picked up , What ? to give a statement , based on opinion is ok , but it really is just that , Ive said it before , I don't rehash magazine articles , give advice, copy popular belief , If I haven't used it , or done it I don't post.and IMO when it comes to a part selection question neither should the inexperienced , If he asked what Color to Paint a Car , Different story .