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I have an '04 #209 with a 347 and a nasty cam. When I installed the Stainless Steel Mufflers, the car I had a 302 crate and the HP went up about 30 at the rear wheels. With the "stroker" I cannot tell how much it helps but most around here (Denver) think about 10% gain.
The exhaust has a "rattle" or "swooshing" sound going thru (either way)2500 RPM. I'm told this is where the cam over lap is and that's what causes this strange noise. It's a nuisance but hasn't caused any noticeable problems in 30k.
There are other threads about the stock mufflers but the "Backdraft web site" went away a long time ago. There are two sets of tubes inside and this does cause restrictions and cracking problems Only issues with SSP muffler is it's 3.5 inches in dia and stock collector is 3.3 (metric).
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