Performance Trends provides drag racing and engine performance software to predict performance. Drag racing software allows you to analyze simulated races inch by inch. Simply input your vehicle specs (axle ratio, weight, engine size, etc.) and enter changes and modifications like (stall speed, weather, headwind) to see the effect on 60 foot times ET, MPH, tire spin and more! Performance Trends Engine Analyzer allows you to build your engine on your computer first to see the performance. This is an obvious advantage to virtually build the engine before you spend money on parts and begin testing.