| IF you are using full three inch exhaust your spool up will be very good with either setup. IMO i would go for the extra top end just because your exhaust is going to make up for any difference in spool up the two turbos have. From what i've read the 600R's had some problems with leaking before. According to Z1 i they fixed the problem but i don't know for sure i just read that somewhere. So you might want to email them(even though they will probably say its fixed no matter what) or ask someone who has installed them recently. Basically though the turbos are very similar, the 530's are known to be very good quality turbo's while the 600R's are more of a better bargain in terms of what you get for your money. Thats my .02 cents
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