I read on the internets that the M45 pushes about 0.75 litres per engine revolution, I've worked out with the stock 944 pulley and the stock M45 pulley the ratio is ~1.9:1. This means the eaton will push 2.85 litres per 2 engine revolutions which equals a volumetric efficiency of about 1.14. Hopefully this will require less boost than an MX5 and as such will be more efficient and may not need an IC. But thats back of a fag packet kinda stuff and I intend to just suck it and see . If anyone can make a better calculation please do so
Tom
Tom