the bloke who done mine originally used a T25 and he said it was a bit lame (although mine has to lug a big heavy mondeo around, if your using a small car the T25 might be OK), so then he fitted a Pulsar T28 and that does the bizz (although now i've replaced it with a hybrid turbo technics T28, very little lag and it pulls like a bastard apart from above 6k revs its not as blistering)