I believe its alot to do with the turbo and a wee bit to do with cam timing/ign advance and a touch to do with the mapping.

Im dont claim to understand everything on how it works tho as alot if over my head.

We have spent alot of time making sure there are as little restrictions/back pressure to help flow aswell.

We have measurements of pressure in just about all areas that we can including turbo, ex manifold, exhaust downpipe etc