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It pays <a lot> to put the kit together yourself. Also, "you get what you pay for" doesn't always apply... The Sp63 seems like a good option for a street car, maybe a similar DBB
T70!!! I thought you wanted a streetable setup. T70 will not spool quickly enough for a sreet car unless you're willing to use nitrous. From my research, 67 or even a 63 mm turbo will be more than enough for you HP goals and will be fun on the street. Some guy broke in the 620 WHP with SP63 on a conservative tune. I really recommend checking the dyno section on SF, it will give you a great idea about the spol characteristics.