528e motor swap?

how hard would it be to swap a 535i motor into a 528e?

Do you have a whole 535i parts car? Because you will need the engine, radiator, the tranny, the ECU and harness. So if you do not have a parts car it is more difficult.

Andy

Driveshaft will also be required and then there is the slight difference in the brake systems (535 has hydrulic boost while 528 uses vacuum) but I guess you can stick with the vacuum as long as you find a suitable connection on the M30 manifold.