2004-2007 Cadillac CTS-V Appearance Mods Discussion, To go for Brand name or price in Cadillac CTS-V Series Forum - 2004 - 2007; Ok, i am faithful to PIAA, and i see they have a D1S kit for the Low beams. But they ...
I had the Hellla bulbs in mine. One of which lasted about a year. As a replacement I bought a cheaper set from DDM tuning for about $55.00 for the pair. They seem to be working fine, although time will tell. I've also just had to replace a ballast recently. I got one off of Ebay for $62.00. I bet I'm going to regret not replacing the other ballast while I had the nose off.
I don't know about HIDs, but for regular bulbs I've found PIAA to be ridiculously overpriced, and their advertising is pure BS ("65W but puts out the same as a 100W!!" ). I stopped buying their bulbs years ago.
My Hella bulbs (35W, 8K) were much brighter than the off brand ones I have now. DDM only sells the bulbs in pairs, so I was unwilling to cough $250 for another set this time of year. Especially when one of the bulbs only lasted 1 year.