G'day Dougal,
I got it installed a few months ago, it has made a big diference to the performance of the standard 4BD1T. Runs through a Brown Davis water pump, to a heat exchanger/radiator in front of the engine radiator, but still behind the standard grill. The intercooler remains cool to touch, even after a decent workout. At this stage I have not adjusted the fuel or boost. The engine was running slightly 'lean' of best performance prior to fitting, ie blowing no black smoke even at full throttle. The boost is now going to a maximum of 11.4 psi, the drop of 1-2 psi being normal. Intake temperature has dropped from just under 100 deg c to less than 20 deg c under similar conditions.
The vehicle has a noticeable increase in torque, is able to attain a higher speed more quickly, maintain it longer up hills, and has an improvement in economy if driven sensibly, which is rarely!.
I'm still undecided on adjusting boost and fuel. More info on WTA intercooler look here,
http://www.are.com.au/index.htm , but be warned, the initial price Richard quoted me blew out, and once it was finished, he wasn't keen to even think about doing another. If you're any good at alluminium welding, he'd keenly supply parts......