Quote:
Originally Posted by KMPrenger
He ordered the American Thunder 409 kit.
I'm not being an @$$, but just read the thread if you haven't already...all the info you seek is in there. The kit is made from the 40 series classic mufflers, so from that I'd guess they should sound about the same.
Basic concensus is that they have a nice low idle, good tone, some raspiness when under a quick/hard throttle, and seem to give nice performance gains.
Hope that helps.
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I may be wrong but I don't believe the Flowmaster axle back kit is 40 series. The 40 series is rounded corners and the kit mufflers are square corners.