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500R is a 67mm turbo with some customization from A-spec. The site claims 3800rpm spool up but the lowest I have seen(I have seen about 5-6 dyno sheets) was around 41-4200rpm for 15lbs. Still a great setup but I think you would be better off($) piecing together your own kit.
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David Jerome
Broker for Speed For Sale LLC ( David@SpeedForSale.com)
(Pre-owned RX7/sports car sales & new parts sales/installs/tuning)
PM me about low priced, high quality port work 
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