Is the P1SC Capable of real power?
Another friend of mine just made 544rwhp on a 2006 mustang gt with a low comp 347 stroker. He is only running 10 psi.
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I would tend to agree with Slowhawk. The D-1 produces about 200 cfm more than the P-1. The P-1 is more than adequate for most applications. I could see a D-1 if you were large CI such as a 427 and could utilize the extra capacity of the D-1.
$200 now or $1200 later to send it back and have it upgraded.

MAN.... 592RWHP through a stalled auto on a stock bottom end?
Keep an eye on that wideband


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