I sent a couple of turbo core's ( K03's and K14 's) that I had to Gpopshop for one K03 overhaul for my AAZ since they do buy cores on ohc or exchange.
They dont get to many K14 versus K03 request's.
I"am going with the optional ceramic coated housings and a K04 exhaust wheel ( Hybrid Upgrade )
I was advised this upgrade will allow better performance and the Turbo wont have to work as hard with the smaller wheel on the exhust side..
Gee-Bee