I agree with herbz. Wanting to go 400+hp, you are asking for problems. I have a Supra TT and I learned quickly that the more power you give it, the more problems you get. Mainly with the tranny and then longevity.
Look, you just payed $40,000 for this beautiful car. Vishnu's XEDE and exhaust will make this a beast already. 4.2 seconds. Jesus. Thats already going to probably be faster than the new M3 coming out.
Be happy and enjoy your awesome car, don't kill it.