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I don't but I can give you some input. Pass on the P1 and go D1 or D1x, honestly D1x is where it's at. P1s run out of steam quick in these larger displacement, higher output motors, they start pumping a lot more heat with higher blower speeds and therefore deminishing returns. D1 with give you more room but D1x will give the most room to grow, it's way more efficient at higher RPMs therefore less need for larger intercoolers and meth.
As far as noise, both are audible. If you want to stay on a budget and love centri noises regular gears are fine. If your significant other is picky with loud exhausts or other noises in the cabin then get the helical gears. Regular gears is a chirping sound where as the helical is more of a fine whistle. BOVs also sound differently.
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