The hood louver impetus came about after seeing my under hood temperatures get to 120-135 degrees while running trails in hot weather - I wanted to keep the engine compartment as cool as possible. Also when it's time to air up the tires after running trails, I don't feel the need to raise the hood (the engine is running to produce more power for the electric air compressor) to keep the heat down.
Keeping the under hood temps down also means your engine is taking in air that's a little cooler, cooler air is more dense than hot air and will product just a tiny bit more power.
The hood louver install was pretty simple, you use GenRight's instruction sheet to locate the optimum place to make your cuts, then make your cuts.
My Rubicon had no under-hood insulation when I bought it, if yours does, you can yank it out if you are doing the louver install.
Use 2" wide blue tape to mark your cut lines on. There is a hood brace that runs down the center of the hood that you don't want to slice when making your cuts for the forward center vent, so use a small diameter drill bit to drill up from the inside of the hood to mark the left/right sides of the brace so you won't cut into them. I found a 4 1/2" angle grinder with a cut-off wheel worked great to make the cuts.
I had some fiberglass insulation which made a great fireproof blanket to lay across the engine compartment while I was using the cut-off wheel. There are a bunch of sparks being thrown, so be sure and protect the compartment.
The kit included black aluminum pop rivets which worked quite well for mounting the louvers to the hood.