As I posted before in 2011, I installed the OEM Factory Remote Start for the 2006.5-07-08 Kia Optima. Part number is U8560-2G000, dealer list price was $325, but purchased discounted for $209.63 from Pat at KIA of Santa Rosa parts (kiapartsshop.com) plus shipping. I chose this OEM system and recommend it because it uses the factory plug-and-play harnesses to install and connect, with just a few extra wire taps needed for additional hookups. If you intend to do it yourself, the most difficult part will be to locate the required wiring harnesses under the dash while following the included instruction manual, which uses line drawings, not photos, so you need to read them carefully first and then search for each specific color-coded connector wire.
The new KIA remote start fob replaces my factory key fob, and my system now requires pushing the top lock button once, followed by the blue key ignition button to start. Pushing the blue key button twice starts the defrosters, and pushing the unlock button opens the door, twice opens all doors and 3 times opens the trunk. I then just slide the key into the ignition on mine and leave it in the on position to run and drive.Touching the brake pedal shuts off the engine, without the key being inserted. Otherwise the system shuts down after 15 minutes running time.
Removal of some interior panel trim is required, so have a set of plastic trim removal tools handy. (Be sure to first check out KGIS online for wiring diagrams and connector location pictures, as well as all the required trim removal steps, which you can print out ahead of time.) You will also need a good set of wire crimpers, needle-nose pliers, small ratchet wrenches and some bright work lights as well, which will need to be positioned to help you see while crouching and working under the dark, cramped confines under the dash and steering wheel. Those familiar with soldering under those conditions can finish the wiring connections that way.
This is a simple remote start system which works fine for me, using 2 new transmitters, and with all that preparation and help, I was actually able to confidently install it myself. I made it part of a set of new leather seat covers and heated seat warmer install. It is so comfortable to have your car pre-warmed or pre-cooled and ready for you before you walk up to it, regardless of the weather. There are so many versions of aftermarket remote starters, including those which just use your own factory remotes and security system, all the way to those which use those slick LCD screen remotes, like the Viper 5902, which runs for over $300 (made by industry giant DEI.) These can even start your car from your cell phone as well as roll down your windows or open your sun roof if you want, and can include wailing sirens and shock sensors, but obviously will involve more installation steps, programming options, modules, apps and labor costs. My 2007 model does not have the imbedded transponder in the key, so it also avoids those extra module parts and labor costs.
So be sure to shop around and decide exactly what you want, need and can afford, pricing the total cost of all parts and installation in your area, if you will not be installing the remote start yourself. Let us know how it worked out.