It was running a small td04 turbo, depending on how much money you want to spend you can make great power! The ecotec heads are a very good design standard! I'm not to clued up on the compression ratios etc of the chev motors but if they like the opel/daewoo motors then it shouldn't be too hard to add some sort of forced indduction.As for turbo vs supercharger its all dependant on how you want the power but turbo is normally the easier and cheaper option but not always! The turbo needs less fabrication and if all is done properly you can easiley upgrade to a larger turbo and make more power. Where as the supercharger is not always so easy, custom pulley, belt tensioners etc to be made. Each way has its ups and downs though