Twin Turboing the automatic is a good idea in my book. You could safely put down 470whp with it. You may want to consider some minor transmission upgrades such as a tranny cooler though since 470 is getting close to what it could handle.
I have the Greddy twin turbo kit.
But you must have care, this transmition is very weak (becouse it's only a normal AT).
You need to let the turbo with little pressure.
Bye!
Forged internals is basically upgrading the pistons and rods to a stronger alloy set. The point is to be able to withstand higher heat and stress levels. It's expensive to do and isn't necessary unless your going to be pushing your car to the limits on the track frequently.
I was making 450hp at 8psi. Safely you can go up to 11-12 psi on stock internals but I wouldn't do it often. I was tuned on a mustang dyno and they generally read a little lower then other brands. The stage 2 is capable of making more horsepower then the stock motor can handle so if you don't plan to go forged internals or anything then the stage 2 will be more then enough.
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