I have done the HID conversion on my wrx(04 H1 bulbs). the new kit should come with a rubber ring that the HID wiring should run through. you will have to drill out a hole for this rubber ring to fit into in your headlight backing plate. this rubber ring will protect the wiring and bulb from water etc. in terms of the drl you will have to disable it, but simply unplugging the module in your engine bay will suffice. you will probably have to remove your intake box but nothing more. trust me this is a great mod for H1 wrx owners i have the 6000k kit and it is the best. hopefully this helps.
if you need any help with this you can give me a ring and you can take a look at my car and how i did it for reference. overall it was a pretty easy install. let me know.
ryan
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