Because I'm planning on going FI very soon, I took a look at SOHO's page for their ported lower, and their dyno charts. The significant portion of the gains are not until 6500K+ (although they do say that the twin turbo test vehicle developed gains 4000K+). From a practical standpoint, the gains are so minimal given the horsepower you're already generating (making traction a very real issue), I'm not sure the cost justifies the mod.
If you're not going to generate 25-or-so rear wheel horsepower until the point you're ready to shift into the next gear, it really doesn't have much value. How much time is that...a quarter-second? It would be a completely different story if it developed low-end torque.
In the end, only you can evaluate its worth, and much of it relates on how you plan on driving your car. 1/4-mile? Track? Street?
Just my two cents...
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Michelin PS4S 275/35F, 305/30R /// Exhaust: Motordyne ART Pipes, Garageline X and Mid-Pipe Combo /// Clutch: ZSpeed EZ-Street Stage II, RJM HD Master Cylinder
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