OP- I guess in the GTS set-up the brake ducts rely on the vacuum effect of air to push its way to the duct openings? I say this because in your track pictures (front) that part under the OEM bumper is closed by the GTS lip you installed. OR you got both the bumper air intake openings to feed into those ducts?
In any case, beautiful set-up and exactly how I hope to have my car done some day. I think the wing makes sense in this car since it's really a track focused / used set-up and not for daily driving "show".
AWE NR | SWIFT SR| PAGID RS29 | RE71 R | 6MT