as above im pretty sure they were developed for rallyecross where restrictions werent an issue at all, im pretty sure wrc just used the escort or ecciv inlet.

think the mountune roller barrel was purely an NA application aswell for the zetec for the s2000 possibly, but has been adapted with machinine to suit a YB.

think yum used a MIS inlet and martin used a MIS plenum but then adapated it to suit throttle bodies rather than the single one suited to the MIS.

Rog, yes i believe they've been named HART inlets? i think which is basically a mix of MIS and standard cover, as its designed to fit on standard YB inlet runners