Had a close look at the Yamaha 3.0 in the late, lamented Taurus SHO. It uses an upper IM similiar to ours. If you look at the feed from the t-body to the L&R plenums it's a nice, gradual curve. I gather that packaging restrictions caused ours to be a sharp turn(s). I'm thinking that it might make more sense to cut apart the upper, and reprofile the passageways from the inlet to the plenums. It would be way cheaper than sending it to Xhone, and my guess is it would be much more effective too. Plus, I've got 2 spare upper IM's.
Oh yes, the SHO motor uses the plenum connector/variable valve arrangement as discussed earlier.
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