Everything. It's better to find a complete motor than try and piece one together. All the accessory brackets are different, powersteering, alternator, AC lines, intake, coilpack, EGR solenoid, throttle cable, header, turbo mounting ears, downpipe, wiring harness, injector harness, throttlebody, passenger side valvecover, oil fill tube, turbo feed line, turbo return line, and I'm sure there's a lot I'm forgetting.
Then there's stuff you don't already have like coilpack bracket, intercooler and hoses, intercooler mounting brackets and scoop, turbo heat shield, turbo mounting bracket, inlet pipe, turbo inlet bell, MAT sensor, tensioner, hole in the block for the turbo return line, up pipe, powersteering fluid reservoir, and whatever else I'm forgetting.
