matt-
HIDs only came stock on the V models. On the non-V CTS, they were an option.
there are a few ways you can find out if your CTS has HIDs or not;
-Face a garage door & turn the headlights on. Check out the cutoff line, if theres some distinct blue-ish tint going across the top, then you have HIDs.
-Turn your fogs on & compare the color of the light (fogs are halogen)... if the headlights are more white, then you have HIDs
-call your dealership & give them your VIN; they can look it up for you.
*edit*
if it turns out you dont have HIDs, then you can always add them.
Go aftermarket, with a lifetime warranty on the bulbs & ballasts.
The OEM color is 4300-4600k; pure white with a very hint of blue at certain angles.
The higher the temperature (K) the more blue/purple your light will look. My suggestion, stay between 4300k & 6000k. Anymore is asking for unnecessary attention from cops. (If you read the box the HIDs come in, & the website you buy from, you'll probably come across something that says "for offroading use only." If you attract too much attention to yourself, a LEO having a bad night might give you a hard time).
good luck
