Not really the place to ask about getting performance out of the na,damn near everybody here is gonna tell you your wasting time and money with an na.I would suggest a very thorough tune up and any maintenance that is required. Maybe get a header and exhaust,and filter/intake,the gains aren't much without internal engine work, but IMO the right exhaust sounds great on the na's.Just enjoy what you have,it is a supra.Not everyone wants/needs(or can handle) 400hp.I love my na's,a lot of people don't respect them for what they are though,they just dog them for what they're not.