hey. lots of reason's for me. i wanted a 170-200bhp motor, wanted a heater, wanted a turbo(jus for giggles and something to play with) and didn't wanna spend loads of money. t4 you need a fan conversion(money) and don't get a proper heater or relible cooling(jus my opinion) and subaru you need to pay out for flywheel/adaptor(money) and sump if you want it low, like me. also i think the weight would be a lot heavier and more rearward. plenty of reasons for chosing any of them thou. i'd really like a roatry turbo...................