They never materialized, because as well as the diffusers, he was working on a hood, grille, side strakes, etc.

He took money from lots of forum members and promised SLR style side strakes, his delivery left something to be desired as many could not even mount the items to the car the fit was so poor.

I chalk it up to a kid with some decent ideas but did not understand what it takes to create an automotive part from scratch and was in over his head...