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mrt...the thing is a banshee when you're flooring it! i miss having it. it has a great sound at idle and it's just loud as hel when you're flooring it. there is a drone, but nothing a stereo can't handle.
Def flowmaster!! I myself have 2 super 40's and have no regrets what so ever in buying those! As far as the break in periods I don't think that's actually true because my exhaust has sounded exactly the same from when I put it on about 12,000 miles ago!
I dont know about yours but mine sure did compared to what they sounded like a year or so ago, they are great. Just give it a little longer, but you wont be disappointed they get louder throater and more defined.