Hi,
I have a (more or less) standard AGP with the IHI turbo. I recently bought a complete engine, ECU and gearbox from an Esseesse version, with the Garrett turbo from a crash-damaged car for a good price.

I was wondering if there is any difference in the actual engine itself, or is it just the injectors and turbo, (i.e., bolt-on stuff) that are different?

I am contemplating whether to just swap the upgrade bits onto the existing engine (which has now covered 115,000 miles), or go the whole hog and swap in the Esseesse engine & box complete (which has covered about 70,000 miles). Not sure which is the most effective way of going about it; for instance, is it possible to remove the injectors without having to disturb the air-con gubbins, etc.

Any advice gratefully received!