DDMtuning.com is best for the price range IMO. You don't need to get slim ballasts, but that is what I have... although their Raptor kit is just as good. I'm guessing it's for an 04 GMC since your sig, in that case you'll need a set of 9006's for the low beams and a pair of H10's (9145) for the fogs. Rule of thumb is the lower you go in K temp rating, the better the light output (best is ~4500/5000k) and the more yellow they get, the higher you go the more blueish/purpleish they get. Most people get 6000/8000k's. I'd run a 35 watt kit to be safe, there has been problems with 55 watt bulbs overheating fog light housings in the past.
Last edited by bartjo06; 06-18-2011 at 10:34 PM.
2001 GMC Sierra SL ECSB - Project
2012 Honda Civic Si - DD
2009 GMC Sierra SLT ECSB - Sold