If you do M3 then you must swap engine, tranny, dme, wiring harness, driveshaft, cluster, exhaust, rear axles and differential...Its a fun swap and not that bad...I love mine!
But honestly I do suggest doing the suspension (coilovers) first because I did engine first and as you can see in my sig (before coilovers) had alot of roll and its hard to tap out full potential of power with loose suspension, car is amaaazing now that I have coilovers to handle the power thru turns.
Mpowered 318is 5speed (95 m3 swap)..Bavauto short shifter..borla..sways..3.23lsd..tms chip..staggered dsII's...fk coilovers
Stock 96 328i 5speed (sold)
Stock 2004 X5 3.0i (Wifes)
Stock 94 318 vert 5speed (sold)
Stock 93 318i 5speed (sold)
Stock 01 330xi
Last edited by E36B1MM3R; 09-16-2011 at 02:37 PM.