Mark Leader runs 123ish mph trap speeds with his car which equates to about 500rwhp in the Z32. So you can make 500rwhp with sport500s but it will be with race gas and right at the end of the turbo efficiency. I think this is true for 2530 turbos too, they seem to make a little more power than 500s. With 16G turbos I always thought that the lag is slightly more than stock. Good luck with your car.
: But the GT2530's will. I know with the Sport 500's I will below what was planning. So is my bottom end build up necesary then (even though it's a little late since the engine is at the shop). I rode in a TD05 18G Z 2 weeks ago and I wasn't impressed too much. But it was more of a money vs what I was feeling. Sure it boosted hard and the gauges proved it, but wasn't worth the money to me.
: I agree on riding in a car, but driving it would be the best as the feeling is always different in the passenger seat. But I'm in Denver where highly modded Z's are pretty much non-existent.......until I'm done anyway :).