I have the 12h-t direct injection turbo diesel engine and h55 5 speed manual. I like the idea of fitting the intercooler. I have seen them on ebay here for fairly cheap. My 12h-t is a little sensitive on the throttle while slow 4WDriving. I had my engine checked over by a diesel specialist at 420,000 km's and he said that other than slightly adjust a tappet and an injector everything else was fine (including the turbo). The only thing that I have replaced on the engine is the water pump (at nearly 500,000 km's). I get about 25 mpg (imperial gallons) loaded on a trip. It doesn't drop all that much around town or 4WDriving. Great engine. It's the body that is starting to let it down as it has rust starting in the roof. I am currently testing it on 100% biodiesel and it is running really well.