Thought it would be a lot better than I got , wheelspin was a problem as it has not got LSD he reckoned so he had to strap it down hard cause I think of the angle the car was sitting on the rollers . First time I have ever seen or done a dyno so I am not sure . I have Hurricane extractors , 2 1/2 inch system , 20 % under drive , Turbo snorkle & F6 lower snorkle , K&N filter , Custom tune from Herrods , 275-30-20 rears & 245-30-20 on the front .