I havent done it yet, i think SandChris did. I hear they work great!
when you switch to high beams don't your low beams stay on also?..mine do, on high beam all 4 bulbs are lit...or is this even normal? ........09 XTXI ordered (4) #880 with the slim digital ballasts from VVME. I think you could get by with just 2 for the high beams and leave the low beams as is. They are bright. Ordered on Monday and received them on Friday at noon. Drove 200 mile and installed them before it was dark. Installation was easy.
Someone told me that I should order the slim ballasts, they are suppose to stop the oscillating that you sometime get with analog ballasts.
This is from a post that figgs posted on 10/14/2009
I put the 880 kits from VVME on ebay. Can't go wrong with a kit from them. Awesome warranty, usually free shipping and are wicked bright. Only get the kits though with the slim digital ballasts. Just my .02.