E30 Zone

I used M52 loom wiring charts when I fitted the M44 to my E30 - from memory there wasn't anything different.
A member on here (I can't remember his name) fitted an M52 to a Ti and I'm sure he said the looms were plug and play.

What age is the Ti?
If it's a late one (after '99 iirc) it will have EWS3D rather than EWSII. No major issue but you will need to cut the White EWS3D plug from the Ti loom and replace it with the yellow EWSII plug - the pin numbers change between versions but the wire colours are the same so just match the wires and job jobbed. The antenna loom connects direct to the EWS3D module (unlike the EWSII) so you will need the EWSII antenna module box (hanging in the top left of the below picture)
This is the picture the above member sent me while he trial fitted the EWSII in place of the EWS3D.

Race battery give you a lot more space

That expansion tank looks close!

Compact AC is utterly shit. Once it's down to temp it's okayish but trying to cool a car that's been in the sun - better off driving with the windows open!