Hey Meshmesh.
Thanks for your comments.
At this point aims are for a staged (ie: bit by bit) increase up to around 300Kw at the wheels. All reading to date seems to imply that cool air equals power, therefore start with the intercooler. In QLD quite often on track temps run high 30 degrees to early 40's, so therefor it is going to be fairly important to keep it as cool as I can. By the sounds of things, the existing cooler isn't bad (in fact quite good), but would chasing 300rwkw (taking into account the ambient temperatures on track) warrant going to a bigger cooler??