Before:
After:
I haven't tested it yet, and I'm half flying blind, since I don't have a scangauge or equivalent. I do have a real-time code scanner, though, which costs about 4x more than a ScanGauge. :P
I'll use it to check my op temps while I'm driving, periodically. If things get too hot, I'll open one of the lower vent holes, then the other. Hopefully, that will cover it.
Duct Tape Mods, Inc. (Cfg83 ought to love this one - it's easy to reverse.)
That coroplast came from a Camel cigarette advertisement... see, smoking (advertisements) CAN be a good thing. (/sarcasm)