Quote:
Originally Posted by PoorMans180SX
It's pretty crazy how close all the EFR's are in spool. The 7670 is a significant step up in wheel size and turbine flow, and definitely won't have the serious low RPM grunt of the 7163. If you plan on running large cams or nitrous for spool, I'd run the 7670 to take advantage of the top end flow, but otherwise I'd pick the 7163 every time.
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Yeah, the 7670 is only rated for an extra 4lbs/min, I really can't think of many situations where that would be worth the loss of response from the smaller 7163.