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I ordered a set or rear window louvers from MRT today for my 2014 GT. I figured that is a good place to start. I've always liked the look of louvers and since MRT engineers the louvers for Shelby American, that's the way to go. Aircraft grade welded aluminum to prevent noise and rattles. Probably 6061 aluminum as it welds nicely. Next, I'll likely decide whether to add quarter louvers, or not and then stripes, or not. I want to be very careful as I only want to do this once!