free two stroke expansion chamber design software

My profesinal 2 stroke expansion chamber design software is more sophisticated than other programs that rely on the outdated idea of a specific tuned length at some point along the baffle cone. Read my expansion chamber theory page to get a full understanding. It links to the free software. All you need to know is the exhaust port and transfer ports duration and the target peak rpm of the engine. You can guesstimate the exhaust gas temperature just by the exhaust duration and the type powerband you want.