Just wanted to say thanks O.C.D. - finally got around to putting in the SMY and a couple Defi gauges myself for my WRX and this post was a really big help. Would not have though of going through the fender well without it, and the whole set up looks very clean with your help
I have one of GrimmSpeed's master cylinder braces installed, and ended up making a bracket off of that to mount the boost unit. Very happy with the SMY, really nice quality and fit, and like the Defi too.
Don't think I could've done nearly as nice of a job without seeing your post here.