| I have to agree with Roland. All cars differ and give differing stock output power. Gains at the wheels will vary as a result, depending on which car it is. The only real test is to measure accurately the stock power at the flywheel, and measure accurately the modified power at the flywheel. The difference between these is the gain made on that car only, and not to be confused with the gains that can be made on all other identical models, because it will be different for each one.
Adam. | 
