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Well, I bought them from SZ and was told they are close, but the 530's spool a bit faster. I was talked into the 550's which I really do like, but I also like the faster spooling turbo's too. I have not had the 530's, so I don't know from personal experience, but I know some guys that race a lot and use the 530's instead. Makes sense that a smaller turbo will spool faster.
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