Heat soak is a definite issue with the PMAS setup, but its much the same with any alloy maf housed unit. Ive had (still have but not fitted currently) the PMAS unit which reached 87ish degrees in Sydneys horrendous start/stop traffic while my Mishimoto closed unit peaks at 70ish in the same...
Having just done this myself just figured id throw my 2c in.
The install is much the same as every other video out there with the exception that there is an additional bolt on each side holding the paddle. Once these are out just remove the rear plastic trim and relocate it to the new wheel -...
While not today (it was last week) i finally got around to getting my GT lowered 25mm all round. Needless to say new wheels needed to follow after that.
Other recent mods are: LED upgrade and US rear decklid
As she currently sits:
Now with working links (thanks flickr)