So far we have converted a standard capacity 996 3.4 Tiptronic, a manual 996 3.4 to 3.7 capacity increased car and a manual 3.8 to 4.1 997 (pictures to follow). Each engine has had the fundamental change a slightly different way and every so often the engine is stripped and assssed to find out which mechanical solution we want to adopt. So far each option is working perfectly with the initial calculated settings but we have to now explore minor tuning adjustments to maximise the benefits.