Originally Posted by kielbasa16

Yeah, I was worried about this. Turns out the base of the NSM covers all holes left by the sports spoiler. The shop plugged those holes, installed the NSM, and applied some sealant around the base to keep water out.

The other option is welding the sport spoiler holes shut, then repainting the entire hatch which of course is more expensive. Or you could swap to a base hatch.

OP - I kind of like the idea raised by somebody earlier, maybe the Aero Jacket III.