4500 rpms to about 6500 is looks like is HUGE.
Granted this is already with an aftermarket probably custom grind cam, but still.
Like mentioned before, with a 'custom to this head' set up, there's certainly gotta be more on the table.
Having said that though, I still think it's going to be more cost effective for 90% of 'daily driver' Mustang owners who modify to go with existing ported PI heads. And I think it'll remain that way for quite sometime, if not forever.
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'99 GT-5sp.
4.10's, O/R H, catback, MT's
13.6@100 1.8 60'
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