Join Date: May 2004
Location: Ontario, Canada
Alright then, well the 9psi kit from supercoupeperformance isn't the Whipple based race kit, it's the standard Eaton based kit. Still lots and lotsa jam, but not exactly "going all out to get every horse out of your engine you can". For a street car though, it would be the better choice between the two. If you're going with the Eaton Based kit, then the intake runners of the manifold will need to be ported to match, but AED will do that in house, for no extra cost to you.
One thing you should consider though is to spend the money right now and have the bottom end of your engine built. At 6psi, some get away with it, but at 9psi your pistons and rods are on borrowed time. Spending the money now, to do it right, can save you a lot down the road.
*1990 Mustang Coupe, 5.4L*
Black on Black & Stroked 'n' Polked!!!