I don't know much about DDM tuning, but from looking at HIDExtra it looks like you would probably need an 9006/9005/H10. I bought my hid conversion kit from them with no problems, and it was a plug and play (no relay harness needed). Wattage would depend on your personal preference for color I guess, but it would probably be best to talk to someone from DDM to see what would work best for your car.

Don't get talked into a drop in kit where you put HID bulbs in a Halogen headlight assembly. First, that's illegal. Second, you'll be REALLY disappointed with the results cuz they cast less light on the road.

Read this article on HID

http://ricksfreeautorepairadvice.com/are...

I would talk to DDM Tuning or where ever you decide to buy them.

Keep the watts below factory, and you will not need relays or a harness. Check reviews, because many cheap HID systems don't last long.

I have a 2005 Chevrolet Tahoe and want to switch from my halogen lights to HIDs. I have read lots of info about people purchasing their kits from DDM Tuning, I would like to do the same. However, I have no clue what size, wattage or if i would need a relay harness. Can someone please help me as I am clueless?