Yeah, I'm trying to find some data on the Mishimoto as far as flow data is, but its hard to find, but from a quality perspective, Mishimoto isn't even in the same league as Garrett. Not knocking your setup, nor do I have any ideas about the quality of this new kit, but I can appreciate that they went with a top-of-the-line brand that is proven on high end builds. Mishimoto is marketed toward the entry-level, budget build area and works great there.
Would be an interesting comparison. That Garrett core holds about 15% more volume of air. Almost 100 cubic inches.
The question is CFM, though. Ratings for Mishimoto say up to 500hp, while Garret rates theirs at up to 600hp..
I smell a test! Lol...