It's a lot of work to put one of these engines in a 2002. I have seen it done here in Scotland. No A/C though
Person concerned did the following
1.. Uprated brakes, disks all round
2.. Up rated cooling system
3.. Seriously modified suspension
4.. Changed the fuel system
5.. Oil cooling
6.. Modified prop shaft
He had to modify the front sub frame and gearbox mounting points to get it all to fit and an LSD is absolutely essential to get the power down on the road
The rule with high performance cars is that they must stop as well as they go!
The engine shown on US Ebay is expensive IMHO. You would be better off buying a crashed M3 and robbing it for parts rather than just buying the engine alone for that kind of money, or import one from overseas.
Malc