I personally had an engineer come out and inspect a Mini Van of mine and he was prepared to sign off on an engineering certificate on it. Changing drive on a car from FWD to AWD can cause engineering and rego headaches with rules but it is possible, but would talke considerable time and money..
On the flipside the SR20 is a awesome motor even better on good boost. However the GTI-R's were potently fast, the handling was really unbalanced and had a really heavy front end that doesn't like to turn and their's very little weight over the rear. They never really caught on and were ummm Dissapointing just because of the poor handling
This would require you to extend panels in nearly every direction as the SR20's arent small motors and have a massive head in intake/exhaust on them...I would say that it would be too much effort to be worth a mini that doesn't handle well.
But good in a straight line
