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I apologize that I don't have numbers for a stock 4-port, I have one right now (slated for a friend), but it is too much work to put it in the car (and I don't want to give up the power). I do know a guy who put down 185 WHp @ 7200 rpm and 145 Wlb-ft @ 5100 rpm on a carb'd 4-port (with completely stock ports on a Mustang dyno). However he was not running a stock intake manifold either.
The comparison is not very fair, but the 6-port did have 9.4:1 rotors while the 4-port was running 8.2:1. They had similar tunes (same ECU). I would love to see some dyno curves from built 6-ports.
I have one from a friend with fully ported 6-port, custom intake w/ ITBs, MicroTech EMS and stock ignition. I can't scan the curve right now, but it made 142 WLb-Ft @ 6600 rpm and 195 WHp @ 8400 rpm (Dyna-pack dyno).
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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