Thanks for the info on the XT. Looking at the Cobb forum - they seem to dealing with the fact that the baja's came with different maps for different years and were asking that anyone with a Baja turbo bring it in so they could develop maps specific to each year. This seems a little strange because I've never read of a similar situation on the other Subaru turbos but it did come from someone on their site.
I guess the benefit from the AP is that it is tuneable and that anyone with experience on the AP could custom map MY car rather that use an off the shelf map.
Does this sound correct?