Just an FYI on the mufflers, the street pro are louder & drone more than the race pro, street pros are a chambered design like flowmasters, the race pro are straight through like the dynomax ultra-flo, just a straight through perforated pipe with some sound packing material in the case, better performance and usually better sound, but the sound things is personal preference.
I have the race pros with a 3" Pypes kit on my E-head stroker 72 firebird and love the sound, very tame at idle but really comes alive at higher rpms, should be a short clip of that on youtube too.
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