OK, decided to go with a water/meth injection system as a way to control EGT's and reduce heat load on the cooling system to some degree. I have kept it simple as the Chev does not have any electronic control, so have gone with an AEM 3302 boost controlled system, formatted for boost up to 35psi. The injection maps are already preset, however simple 'injection on' and 'injection off' selector knobs are all thats needed to be adjusted, and the kit comes with a couple of different injection nozzles to play around with. I intend to be running water only, no methanol as the HP gains are in the s/c and this also allows me to draw down a water source from the 130L water tank i have on board for my supply, hence no need to find another bit of realestate for a 20L tank and have the headache with methanol which is a poison. I shopped around and found a mob in the US who have sold me a kit at $359 USD plus shipping, so this works out around $250 cheaper than buying ex Aussie. Its a really good price, circa $200USD off their list price. Thanks @nissannewby for the prod in this direction, I think its a good starting point and can alow me to improve in steps if required when and if i strike heat issues.