i have been looking into putting an aftercooler on the f banger. i have been looking at cheap aftercoolers on ebay. the question i have is- how big is big enough ? at this point in time i plan to stick with the std turbo. i have an egt gauge to fit. i plan on turning up the pump a bit. on one post here, 1 cfm to 1 hp was mentioned. is this the go ? the cooler i reckon will fit in the front easiest is 400x220x65mm. with 3" in/outlet. any suggestions ?