| and what you intend to use the car for. dyno queen that you have to rev to 9 billion rpms to get power or broad power band (for the most part)? 500's are pretty much a direct bolt on (with tuning ofcourse)...and im unsure about the others. 535's are $ but may be worth it. ..check out the turbo compare thread [ http://www.twinturbo.net/net/viewmsg.aspx?forum=technical&msg_id=839668 ]
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