numbers. He is very secretive about his dyno and tuning. I doubt he is making living from drag racing to be this secretive. Is not like there is strong competition among the Z's. All the supra guys post their dyno numbers and settings to help the other supra owners. But the top 300ZX on here and we can't see a dyno chart or get more information on what it dynos. When I dyno my car I am going to post the charts and info. I'm not knocking the guy. He is very helpful on the phone and runs a good business. SGP did my heads for my engine .