Yeah , nitrous! I've got 400 bucks in my zex system, bought it brand new off ebay. No problems to date even without a ignition retard. Took me from low 15's in a SH to trap speeds at 102 mph at 14.5. And yes before anyone says it I know 14.5 isn't a good time with those traps. I'll throw down some 13.90's slips before the years over. I've got some stickies, msd digital 6, purge, and bottle warmer being installed! Nitrous is the biggest bang for the buck period. Instant turbo basically at the flip of the switch and the foot to the floor. Also nitrous isn't everyday wear and tear on your car like F/I. Lots easier to go all motor N/A and add the juice. Makes for a better daily driver in my opinion. Don't have to tune the damn thing every two weeks to see if things are kosher!