Flowmasters resonate on the highway so if you never drive over 50 for more than 2 minutes then a flopmaster is going to be ok. The best sound and tone I've ever heard is from a moroso spiral flow. I cut my exhaust just before the second cat, then full 3" with a spiral flow. Here's a link http://www.moroso.com/catalog/catego...?catcode=35054
The only problem with these are that they cost quite a bit brand new.