Turbos are absolutely terrible on a road course... don't even think about it. The kenne-bell is a terrible idea, too. They do not move enough air to reach your power goals, and the torque down low can actually be hard to control.
In all honesty, I would not be thinking about a power adder if I were in your shoes. The extra weight up front will negate in the corners any advantage that the power will make up in the straights unless you're running at Talledega, but if you're going to do it then I agree with 90lxcoupe; go with a centri. Too much low-end torque on a road course is going to be hard to control, but a centri will let the power come in the higher part of the powerband. You should not be thinking 2k rpm. With a motor that revs to 7k, you're never going to see less than 4500rpm.
Heat soak is going to hurt your consistency considerably. Think overkill on an intercooler. I can't imagine you'd have any preignition or detonation problems with a mixture of meth and race gas. Both have motor octanes in the 120 range, plus meth if injected into the intake tract will lower IATs.
Now to some other points in this thread:
Not really. I made 762rwhp on 93octane pump gas with 120lbs injectors and a 331 @ 14.5 psi.
First, that's not how boost works. The engine combination decides how much power you'll gain for each pound of boost. With a 400rwhp n/a motor like yours, you're going to pick up a lot more than 15 hp for each psi, well over 20 in fact. Second, Every power adder i've looked at becomes inefficient at some point. The efficiency of the power adder will depend on both the pressure and the volume of the air it's moving! So, while the KB might be efficient at 18psi on a motor moving less air than yours, it might run out of steam before it ever gets to 18psi on your motor. If you haven't seen a KB making over 500rwhp, that's why. It's also why you'll see turbos rated to a certain upper HP limit. That limit is the maximum volume of air that the turbo is going to push on an engine perfectly sized to take advantage of the turbo's boost efficiency range. If any of my understanding carries over to the KB blower you're looking at, you'll not likely make any more power than you've seen others make.
why?
I'm with you on the added nose weight.
Here's the bottom line bragging that you hang at 9" doesn't mean squat if you can't use it for getting down to business.
A dedicated road coarse car; if it were mine, would have the biggest brakes I could squeeze on the front and rear of it with adjustability, full
suspension work with all urethane CC plates, most-likely all coilovers, major chassis stiffening/bracing both front and rear towers... Moly full cage with non removable side bars and goes through the firewall to the front towers, overkill for a cooling system, torque box kit, a baffled fuel tank/cell, best rubber on the lightest forged rims I could buy and then after all of this, I would look into building some power. Don't forget the lightweight seats with current 5 point harness.
Foxes are nose heavy. Manual rack, manual brakes, K member and a-arms, alum heads electic pump, fans, high rev clutch, quick release quad, TKO, alum shaft with two safety loops, and build an engine that will be in the 3500-7500 power range and tune an exhaust to compliment it.
There's plenty that I have left off, but all the power in the world won't compliment a poor chassis on a road course.
So I guess the real question is, do you want to brag about big hp, or respectable lap times?