Define diffuser. A lip on the bottom of a bumper is not a diffuser. An underbody panel that smoothes the air flow and channels it outward while accelerating and lowering the pressure that ends at or after the rear bumper, is a diffuser.

As far as I know, only trd has made a diffuser, and it is not their bump but a panel underneath the car that only fits if you change out the exhaust.

The only thing that prevents me from running a single exit is that we dont have a single exit diffuser. If someone makes this that keeps access to the tow hook im buying!!

if the fr-s had a single exhuast diffuser.. i would have gone with the greddy RS exhaust system. :(

my bad, i read "exhaust".. sorry :)

seibon makes a CF rear diffuser cover. if they changed their mold to a single exit that would be sweet.

Someone on here made a cover for one side to make a single exit. Not sure where it is, but I'll look around.