Can anyone tell me what the P.P.F. (Power Plant Frame) does?? Also where the hell is it on an FD?? I've seen some aftermarket ones from Mazdaspeed, and RE Amemiya, but I just can't even tell what the hell it even is.. Does anyone have an aftermarket P.P.F. on their ride? If so what has it done for you?

 

I think the ppf if the goofy looking thing on attatched to the back of the tranny.

 

Yeap, it ties the tranny and diff together. Its almost impossible to see if you have stoc exhaust.