Not sure if anyones done the mod but the ABS probes fit into the hubs and not the calipers. The probes pick up there signal from toothed wheels on the drive shafts at the rear and stub axles on the front. The wiring might well be there (although I doubt it), but you would need new hubs, drive shafts and stub axles so I would think cost would make it unattractive. I have ABS on mine and in the 3000 miles driven never had the ABS cut in, so I would say little point.
I shudder to think of the cost. I have an F with no abs and a TF with; not bothered either way for the MG, in fact would prefer the non-ABS on the F, having had the ABS activate on wet manhole covers braking at/near for junctions and scare the sheet out of me..............lethal.
Out of interest, I have just been looking at the Rimmer Bros parts diagrams and listings. It doesn't seem to show two different rear hubs or CV joints ( which I think is the rotating part which the sensors work on) for ABS / non ABS models
Yes the CV joints and brakes are the same on ABS and non-ABS F/TF’s. Non-ABS cars will have brake balancing valve removed as the ABS pump does this job. The brake pipes I think are the same so the front pipes would need to be replaced, you will need to add wheel sensors, wires, the pump and I assume the ECU to control the system.
The wiring will be the issue. I pulled out the wiring diagram headed 'Antilock Brakes (ABS)'. It is extensive including (excluding the ABS pump and wiring) interfacing with brake lamp circuit, instrument circuit, brake lamps circuit, instrument circuit, brake lamp switch, satellite fuse box, under bonnet fusebox, diagnostic circuit......Is it worth it? I have not checked but I assume the Trophy had a different wiring loom to the MGF VVC, if so, there will be no unused wires. You could probably buy the ABS wiring loom of a trashed MGF VVC.