TurboXS TMIC? I am going TXS FMIC for just ~330whp. If you're really going for 500whp, then think about the heatsoak your TMIC will suffer from. More power = more heat, and therefore more retarding on timing in certain driving conditions. Other than your internals I would imaging adding meth, both as a power adder and as a way to help guard against detontation. Depending on how you're going to be driving this beast you may get away with the stock transmission components but I would certainly be looking at a new clutch.