I finally ordered the TTI system and went with a 2.5" sysytem. I did this because the header collectors are 2.5". Car currently had a poorly done system with slowmasters on it and the interior resonance is annoying. Also the welds on the slowmasters are rusting.
These 3 muffler types I have narrowed it down to are all dynomax. The Walker Ultraflow SS, Dynomax VT or the Ultraflow welded.
What I want in order or importance is least interior resonance and most performance. I do not care at all about outside noise.
Gentlemen, begin....