The louvers are held on by 6 hinges that have industrial tape on the back, which you then silicone down. The top two are optional, but i did them just to feel safer. they then have a plastic screw top that goes through the louvers and connects with the hinge. The tape and silicone took about a day to completely dry, and it took about 30 mins to properly line everything for the install. I Bought them off eBay, for i believe $270 or so. The seller was Carid or something, it came from carid through eBay, so its the same company. i thought $270 was abit much for plastic, but i really wanted the uncommon flare, so i got it as my Christmas present.
Really quite simple install, and does not affect view much really. The side window ones will be hard to get a hold of though.
note your windows will get very dirty, and if your like me you won't feel like taking them off to clean, which is not hard really. the grime does not bother me so i wash the window rarely.