I found a Rtek 1.7 for a great deal, and I was thinking of putting in a little bigger primaries, maybe 680cc and 750 secondaries. My new turbo is about the same size as stock but it spools too fast and now is way too lean between 3000 and 4000 rpm range. It hesitates and cuts out, so I am hoping this will solve my issue, if not I guess I will have to save up and go with a Power FC or something.