I don't autocross, but I doubt even the best tech inspector would know to look for it and be able to identify the originally installed item vs. the DMD. And IF they wanted to squeeze in there and ID the Ford PN, they'd still see the part number originally installed on our vehicles. Unless they read these boards, or were familiar with BAT's catalogue, or compared two Duratecs side by side, there would be no way to know.
It is different than sneaking in a Quaife - this part should have no significant effect on performance as far as I can tell.
