I just measured a 450 head for you - it is about 5-1/2" - but then so is a 350 (and probably others as well).
Nice looking exhaust, but I think it may be 1/2 of a system for a Honda 4........those flanges don't look right.
Thank you tbpmusic. The more a look at this the more i agree with you 1/2 of a four. It is not a 750 though,as i have a couple of those and the ports come straight out. I have no use for this and would like to get it in the hands of someone that could use it. But it is a hard sell if i don't know what it fits.LOL.
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