This tool may help some. When doing modifications I like to take a scheduled approach, not just adding more horsepower and torque. There are other things that can greatly improve performance. I.E. suspension upgrades, gearing, losing sprung and unsprung weight. This thread is not to slam others about their performance upgrades. It is a spot to discuss an approach to upgrading the performance. All questions and input is appreciated. But we will not get into slamming each other or pushing products in here. Basically a place for mature performance discussions.
http://murray.faithweb.com/formulas.htm