Munky:
1: Go for it, I've got the stock N/A peashooter still and it's fine...so an aftermarket one would suffice (I'm gettin my one replaced one day though)
2:Yes
3:You're not getting your money back anyway so spend away
4: You would hope to god no...but things go wrong with any car, yours wouldn't be special
5:It depends what you want out of your car, and what supporting components you have
6:A remapped chip to take advantage of your mods and to get extra power from adjusting the factory MAP