No rubbing issues noticed yet, but I've only had these on since this morning so we'll see. Hopefully not.
No, I didn't do a write-up on the bumper mod, mostly because there was no plan at all, I just kinda made it up as I went with a lot of help from my auto-body talented mad scientist brother. To be honest, I wouldn't recommend doing what I did because the fiberglass, bondo, and bumper plastic don't flex/expand in unison with temperature changes so slight cracking is starting to come out. If I ever get to it, the best thing to do would be to make a mold of this bumper and then fab an entirely fiberglass bumper which I would really like to do some day. I also want to make a matching front bumper too like the one they have on pfyc. I've never seen a modded GTP rear bumper so I thought it'd be a neat, unique thing to try. To get the scoop to fit though I had to cut out a square from the sheet metal behind the bumper. Not a big deal at all, but you need a decent disc cutter to do it.
Here's some more bumper shots (I don't know why I left the trunk popped for the pic. lol.):
I went to the junk yard and got some honeycomb grill mesh from a Pontiac minivan and cut it to fit in the scoop holes. It turned out pretty good. You can
barely see it in this pic: