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They just sell the bulbs and ballast kits - so basically you are just replacing the OEM halogen bulb for an HID one. Light output will appear brighter, but since they are designed for projectors - you are only going to get a fraction of the available light out of the assembly. No modding of the lamp assembly, just plug and play + wiring for the ballast.
Personally, I'd advise against such kits. Since there is no projector, you tend to get stray light shot everywhere. Too easy to blind oncoming driver's with this sort of kit - when you could spend a little more time and money to do it right. There are a couple of good DIY on this board for retrofitting projectors.
These kits are more attractive, price point-wise, but can't always go by price. Double check with local laws before you install these lamps. Some places will not let you run any aftermarket lighting - the "fix-it" ticket will likely cost much more than the kit.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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