As noted, I ordered the XL hi-flow louvers. Installation took maybe 4 hours. I'll get a chance to seriously test them this weekend as it's supposed to be 110* tomorrow and I'm heading for Hollister, so both interstate and trail running.
The video shows pretty much the installation. Attached are some photos of my installation.
First, figure out where you want them-
Then start cutting-
If you have cross-braces, make like a cheese...
de-burr, mask, and paint
Then start riveting. The end result:
A few extra pics here:
Some people have asked if I'm worried about water getting on the engine. The short answer is no. I've done water crossings; I've pressure washed the engine bay; I'm not that worried. If I had a carb'ed motor with an open element filter I might make a water diverter. Or if the louvers were directly above the alternator (they aren't) or the distributor (don't have one on most late-ish model vehicles). Maybe I'm being optimistic, but I don't generally park in the open and when driving the air should be flowing up and out so I don't expect rain will get in much more than normal. The engine should be able to stand a drip or two. Time will tell.