I have a '92 300zx NA 2+2 with $800. What upgrades could i do for this price?

 

you choose

JWT POP CHARGER : 100
UD PULLEY: 200
JWT ECU: 600
EXHAUST : 700
HEADERS: 550

get the pop charger and pulley first....w/ the rest get a upgraded clutch to handle later upgrades.

"Sometimes I Feel I Have to Compete With Your Car"

 

I'd get an intake, exhaust, and pulley. I think the NA guys love their pulleys. It's one of the best bang-for-the-buck mods for the NA's. The JWT ECU doesn't get great reviews for the NA's so I'd hold off on that for now. Make the car breathe better (intake and exhaust) and let it rev quicker (pulley). You should like that to start.