yeah, the swap is something very major and I am assuming you are planning on droping it on that E30 m3 in your sig.. not only would the engine be a pain to swap, tranny would need to be changed, assuming gears would need changing, and the software would just be - OUCH, someone on bimmerwekrz swapped an e30 M3 engine (I think) on his 318 and a great turnout, might want to look into it. But might I ask why you are wanting the swap, because it sems to me that you allready have an m3...