I have the game Police Simulator: Patrol Officers. In it, there a DLC which changes the skin of the vehicles so that they for undercover cops. My question is simple, do real undercover police use these kinds of vehicles?
They’re unmarked/covert vehicles, not undercover. Undercover cars wouldn’t have any police equipment or ELS (at least not to the extent shown here).
Oh yes, they are very much a thing, at least here in the US. As mentioned, they're considered unmarked, not undercover. Here in New York State, the State Troopers typically field Chargers, Tahoes, and Interceptors in a dark blue base coat with a large reflective yellow band down the side. Each town and county sheriff department also has mainly marked cars in shades of blue, black, and white with various decals as their primary patrol cars. They're all pretty easy to spot, and they'll usually park where they're noticeable to deter speeders and make their presence known (there's a few spots on I90 and I87 around Albany where they'll park in the median just so people slow down by recognition alone). The unmarked cars are usually Durangos around here, but I've seen a few other brands. They're usually a dark gunmetal gray with the only identifying giveaways being lights inlaid within the grille, possibly a larger antenna, and sometimes lights behind the tinted windshield and rear glass (if you can see it). Those are usually the ones that hide in traffic and tuck in behind blind cross roads and wooded medians to catch speeders and other reckless drivers. It's pretty comical to be doing 60 in a 55 in the right lane, then have someone blast past you at 80/+ in the left and watch them go past one of them. I saw it happen the other day on the Taconic... the dude raced past me and slammed his brakes about a hundred feet away from an unmarked SUV. I bet that was a fun ticket! lol Some towns and states just use unmarked and/or ghosted cars as their regular patrol vehicles. Growing up in Connecticut, the troopers there always had dark silver cars and SUVs with a light bar, with some of the newer cars not even having a bar, or if they do it's a low-profile one. The patrol SUV for the town where I live in NY now has black vehicles with ghosted black lettering.