My PW splitter does seat on the core in the front, but does not include the back two rows of fins. I measured the splitter for someone else that had to modify their duct considerably and they were sending a note to PW since it seemed the splitter they had was different dimensions than mine.
My only issue has been cutting the insulation on the hood to allow a bit more room for the Forge BPV and putting in some adhesive cushion to the hood where it touches. On their australian forum they were discussing an update for fitment to avoid the BPV issues. No update on that from what I've seen.