hi there,
I did a Mivec/cyborg swap myself on my CJ.
went from a 1.6 to the mivec with exhaust, suspension gearbox with lsd.
a gsr engine is also a 4 cylinder, so it won't give you any trouble with the MOT. if you're planning to do a FTO conversion, which is also a lovely conversion in England/Ireland, you are from a 4 cylinder to a 6 cylinder, and then they won't give you a new MOT.
(without having new papers from the RDW)
a gsr does have a other engine code then the original 4g13 or 4g92. thats the difference you do need to recheck.
I haven't been at RDW yet, cause i need the history of my Mivec engine, it came from Ireland, and don't know the chassis number of the old colt, so I think I will never get new papers.
so for the police, they won't see the difference between a normal colt engine and the gsr (only when they have got a little car knowledge, they will see a turbo and maybe it is a DOHC instead of a SOHC engine.)
if you have got any questions, feel free to ask.
Ukkie.