I put Flowmaster 40 Series deltaflows on my 98 Cobra. They are loudest when accelerating through the 2000 RPM range Above that they mellow out. Unfortunately, that is about highway speed in 5th so it has been a little annoying unless you have some wide open road, but they sound good.
See my post in the Specialty section. I think that I might have lost power with the new mufflers.
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