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I'm thinking about going this route myself. It looks like it from the pics., but would like to make sure - do the vents pull flat against the hood on all edges when you snug them down?

The temp here in Phx has been around 100 for the last couple of weeks and the hot air rising out of the vents are enough to keep a piece of light yarn tied to the vent dancing around. Unfortunately, I did not done do any before temp ratings so I wont have a baseline to measure from. Its obviously evacuating heat from the engine compartment effectively though, my hood cools down alot faster than before when the heat was trapped and kept the hood toasty for a long time.
To answer the price question, I think the D-pillar vents were around $40 bucks each(?) What I liked about these were that there were 2 threaded studs on each end of the vent that made for easy attachment points. The brackets were made from simple 1/2 inch aluminum stock that was bent, drilled for the studs to protrude and nutted down. Actually it was easier than first appeared!
The only thing ,as you can see, that I have left to do is to dress/edge the cut hood liner. I dont think an adhesive tape would stick for very long on the liner material. Any ideas or suggestions out there?