My bro has a 6mt 350z also (CAI, testpipes, y-pipe, exhaust), and we did some runs when my car was bone stock and we were even until the end of 2nd or so, but once we hit 3rd I would start to pull on him hard so its not much a surprise since you have a SSTT. Z's are very fun cars to drive though.
When I use to run my bro's car with my s2k it wasn't even funny how badly I could pull on him. He use to get a good head start and then he would just laugh as I blasted by him by the next gear.
When my s2k was NA though, our races were just about as close to a driver's race as you could get though, it just depended at what gear/speed we would take off from. Those runs were a lot more fun because it actually took skill to edge out the other car and win. Good times.
