Excellent. I have been advocating keeping the inlet temps down on the gdi this way for some years. Now, since you are handy with ally and tin snips the next thing to do is make a valance for the front. It,s very easy and quite satisfying to get it right. Better still junk the horrible restrictive standard cat and fit a free flow four-branch manifold and a 200 cell cat outside the engine bay. Finally a very wise move with any gdi engine is to run the pcv breather to a catch tank and then atmosphere - or just to atmosphere if you,re not too fastidious. Inlet valve fouling is now too well documented to ignore.
Have you had the GDI through the MOT emissions tests with a 200 cell cat and no PCV?
