I have a TTI header, 21/2 inch exhaust system and the the dynamax mufflers supplies with the system on my duster 340. My motor has just been is rebuilt with cam and pistons last year. I have had a lot of compliments on sound of my exhaust. It's not to loud but still not over bearing. At 60mph it has has a nice rumble tone to it and you can still hear and talk inside the car. My friend just got a duster 360 with flow masters. He can't hear himself think at idle or driving it is so loud. Needless to say, the flowmasters are going into junk pile.
Loud doesn't make horsepower, only noise