i wana get HID kit for my fogs wich one better the slim ones or regular old ones? like quality? ... and do i need relay harness?

 

I just put ni a kit from HIDExtra...9006 ..6000k.. the ballast are like 5/8 to 3/4 thick, went in just fine, all just plug n play..no u do not need a relay kit if u use theres..been working just fine...I am very happy with it!

 

The ballsast size really doesnt matter IMO, I would only recomend the harness if you plan on running a 55w kit but you could probably still get away without it.

 

Both is the same dude, they just charge you double for slim ones. You will need a relay if you want them to never flicker in the long run.