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As long as you do not exceed the boost recommendations from SZ with a stock motor, and get a good shelf tune from them based on your setup, and you're golden.. However, to answer your question-Yes... I have driven both.. The 530's are awesome, an great for Zippty-do-dah street light, to street driving... But IMO after you drive a 675, an experiencing similar spool with supporting mods... You'll be sold on 675's for the extra head room for powah.. -Mario D.
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