gears. I am only boosting 8lbs w/o a boost controller. I am guessing it will be 15psi of boost by 4000rpm. It is laggier than stock. At least on the freeway. The car still needs to be tuned to reduce lag. 8psi is barely getting into the turbo . w/o a boost controller, I am sure the wastegates ae opening up before 8lbs. Boost controller will hold the wastegates shut to get a sharper boost spike. Mike