First off I will cover the pros and cons of true HID's versus stock halogen. The true HID's are not the blue bulbs bought on ebay cheap. HID kits come with ballasts and an HID bulb which is a completely different design when compared to halogen.
Better light output, less power consumption, longer life (when installed correctly) due to the fact the HID bulb does not contain a filament that can break from vibrations, and some kits cost less than halogen bulbs but some are much better.
They are illegal if they were not installed from the factory (although most authorities don't do anything to enforce the law), most local stores are not going to carry replacement bulbs or ballasts (this varies though), and in some headlight housings the beam scatters so much as to not offer any benefit over stock.
Some general information when looking at HID kits
Some places sell "HID-style" bulbs; these are not HID's, only higher wattage bulbs that can melt the factory socket and wiring due to the heat they put out. Watch out for these, they are not worth the money.
A 35-watt HID kit is the most common and runs cooler than the factory halogen bulbs.
A 55-watt HID kit runs hotter and is not recommended for small headlamp housings since they can melt. They are brighter, but the beam may scatter more, compared to the 35 watt kit, and blind oncoming traffic. Also, the color temperature will be washed out some. For example, an 8000 Kelvin HID kit will look more like a 6000 Kelvin kit.
Larger ballast, consumes a little more power, works well
Small ballast (thin and about the dimensions of a credit card, easy to hide due to size, works well for gen. 7 malibus due to space limitations behind the bumper cover
The HID color temperature scale (rated in Kelvin)
pure yellow, meant for low visibility conditions, used in fog light housings
white with some yellow, good for all conditions
pure white, good for all conditions, brightest color temp.
white with a hint of blue, good for all conditions, also good for show without sacrificing much light output
blue with a little white, it is dimmer and more for show purposes
pure blue, for show purposes, not good for regular driving
blue/purple, for show purposes, not good for regular driving
Bulb fitment through the years
5th gen. 1997-2003-
9006 low beam and 880 fog light
6th gen. 2004-2008-
H11 low beam
04'-06'- 880 fog light
07'-08' classic- H11 fog light
7th gen. 2008-2011-
H11 low beam and H11 fog light
Parts needed (all years)
HID kit 35-watt or 55-watt and color temp. of choice
HID relay harness which provides direct battery power from the battery for longer life and less chance of flickering due to small gauge factory wiring
No error code eliminators or adapters are needed for factory headlamp housings on any Malibu since they do not have a bulb-out warning system
Generation 7 Malibus need either the DRL (daytime running light) fuse or relay pulled from the underhood fuse block due to the fact that the HID's will not function properly as running lights. They will flicker and shorten the life span of the kit.
I do not know for other generations if anything needs to be disabled or not.
Adjust headlights as needed to help avoid blinding other drivers
HID's will not work well as high beams, they take too long to warm up and will scatter too much to have any benefit
Do not turn HID's on and off constantly, this will cause hot starts and void warranties, also the bulbs will burn out faster.
Most of all enjoy the new found increased light output, it is great to have .