When using a ST205 GT4 water/air charge cooler (or any higher BHP charge cooler) you need quite a big radiator to get them working properly, like smal car size... A lot of the MR2 swaps use a Rover Metro radiator! plus there's the extra plumbing/complexity to consider
... For simpicity's sake a nomal air/air intercool would be the way to go. Top mount may be an option if you don't mind having a big bonnet scoop. The later 3S-GTE's in the ST215 went back to using air/air topmounts
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