There aren't any buyers guides more recent than a few years ago because they haven't been sold here since 2019.
The DCT isn't available in the ST. It only came with the 6 speed manual.
There were hardly any options available, so most came equipped similarly.
The early cars had overheating problems due to the cooling system tank, so there was a recall. That covered 2014-15.
The suspension got a recalibration in roughly 2016, which is also when the Sync system got its upgrade.
Backup cameras came in, I believe, 2018.
Cars that came with summer only tires got different brake pads, identifiable by the red brake calipers. But you can install whatever pads you want, and many used cars will already have aftermarket pads.
The Recaro package is desirable unless you're one of the people who doesn't fit in the narrower Recaros.
You could get navigation on the Sync 3. I like it. A lot of people prefer to use their phones.
There is an available sunroof. Some don't want it because they claim it makes the car top heavy and handle worse. Some have had problems with its rain rails leaking.
There were extra cost paint colors, but they are the harder to find colors, except the platinum white.
The biggest thing to look for on a used car other than what you'd look for on any used car is whether it's been modded. Many have modded their cars, and not all modded cars are equally desirable. You also don't know how well the mods were installed.
Exhausts are obvious, and very few of the available catback exhausts are pleasant. Loud, yes.
It has been fairly common to remove the catalytic convertor in the mistaken belief that a straight pipe improves performance. It doesn't. (Exception exists if a large turbo has been installed, but if you're buying used you might stay away from those unless you want to work on the car a fair amount).
Engine mounts are a common mod. Some are good, some not. Increased NVH is part of the motor mount game.
A very common mod is an accessport and tune. Unfortunately, few cars that have been tuned are sold with the accessport. Then the buyer is stuck with a tuned car but doesn't know what it's doing and can't fix it unless he gets an accessport himself.
Intake mods are common. As with any car, a lot of them are worse than the OEM airbox. Buyer beware.
Many have replaced the radiator and/or intercooler. There is a common belief that the cooling system is inadequate. It may well be if you mod the car and use it in high temperatures or constantly keep the revs up by driving around in low gears. On a stock car, you should see no troubles in ordinary driving even in 110 degree high humidity temperatures like we commonly have where I live. In most cases, the aftermarket radiator and intercooler are good pieces, and as long as nothing was damaged during the installation, I wouldn't be afraid of them.
The sound symposer has been deleted on some cars. In states where they check, this may cause some trouble with emissions inspection.
Likewise, some have replaced the blowoff valve.
