okay here is where it gets fun,
1. support engine from below with 2x4 and stand, prefferibly with engine hoisted slightly higer than normal.
2. remover passenger side engine mount and ground cable
3. remove center section of exhaust if not already
4. manifolds should drop out at this time, might need to lift engine slightly higher.
5. if replacing with headers, they will require a little puzzle work i.e.. turning and twisting in odd angles to get them te fit together
6. remember to attach all senors prior to bolting up securly as you will not have the room after.
hope this helps, BMW has a special tool that lifts the engine from above while supporting it from the frame.
:thumbup: