well, I know who I wouldn't trust to fit ITB's... basically it boils down to experience and customer support, i'd not trust a Jonny come lately to suddenly start fitting 5k engine installs after a few successful oil changes and filter relocations put it that way.
GDI and Angel Works are the only two companies who I think are competant enough to do the work 'properly' and know what they are doing, they are also the only 2 companies who I could deffinitely say have done all the work themselves and are solely responsible for completeing it all in house. ie from installing it mapping it...
Having said all that I'd still only take it to GDI (obviously
lol) for reasons I wont get into.
Loads of people can do these conversions or claim they can, I'd want one place that can do it all in house, so then any problems and they will have a better understanding. I mean there's no point having someone that got someone else to do the map for example, what if you then have bring it back? They wouldn't have a scooby