A long time ago I bought a CD of exhaust systems that I think was made by Jim Hand. He had a 455 set up on a Dyno, then hooked up a bunch of different exhaust systems on it and recorded the sound. He explained what had been done to the engine (cam, engine work, etc...). He would then start up the engine and let it idle for a bit, then bring it up to about 2000 RPM's and hold it there for a few seconds, then rap the throttle a few times and let it return to idle. He would then tell you what company produced the muffler and what part number it was before moving on to the next system.
I picked the exhaust for my 67 GTO by listening to that CD. I still have it somewhere around here.
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