No offense Chris but that thing almost looks home made. Wow look at all those sharp edges!?
Don't have much experience with jet boats but do have a fair amount with SeaDoos. I invested in a Worx intake grate for my XP a few years back & the results were dramatic. That ski stuck to the water like glue! Handled much better in a chop, cornered like it was on rails, etc.
Doubt if returning to stock will net you anything 'cept mebbe a hair more top end on glassy water. But the increase in water delivered to the pump in less than glassy conditions is well worth the trade off.
I'd go ahead'n take it off but only to smooth/round those sharp corners. Mebbe slap a coat of paint on it.
The holes are interesting. Wonder if they're there to aid in holeshot a la a ventilated prop hub?