Your 330 already has a 3.38 if you're an auto, so a 3.91 is the only thing worth swapping in. You can try to find a 3.64 out of a ZHP so it's still manageable if you go manual. Nitrous is cool, but not worth it...it works out to be expensive in the end because you have to constantly spend money to refill it, and it's not instantaneous power. The bottle has to heat up for full pressure/power, and it's not on all the time. That's why I went forced induction.