I wanted to do this over a year ago and just never got around to it. I had ordered the fog bulbs (H7) a long time ago when I upgrade my headlights to the 55w DDM Slim Ballast kit but found out the hard way my stock HID ballast would not work with the bulbs that I had ordered. So I order the Apexcone Raptor HID Kit from DDMTuning, which are about twice the width of the Slim ballast kit. I wish I had gotten the Slim Ballast kit because finding a area to put the ballast and not block air flow to the intercooler was not easy. I finally settled on placing them under the intercooler ducting and the inside lower part of the bumper. Kind of hard to explain. Either way they are out of sight and should stay pretty dry. The fog lamp housing requires a little modifications to get the HID bulb and wiring to working. I'll try to post some pictures to show you what I did. After some quick wiring I got everything fired up. I was surprised to find out that the beam pattern is pretty sharp for the fog lamps. Almost comparable to a projected headlamp (meaning: using optical lens). I re-adjusted the fog lamps levels to make sure they were not pointed to high. With 55w HID headlamps (compared to stock 35w kit) and 35w HID fogs, the last thing I want to do is blind people and or get pulled over by the local authorities. So they have a 10-15 degrees downward angle similar to the headlamps.
I took it for a test drive and living around Seattle, WA it was raining hard. The conditions were perfect since 3000K is a true yellow color so it helps illuminate the road better then other color ranges in wet or foggy conditions. At first, I was a little disappointed that they weren't brighter but then realized that this ballast kit aren't as quick to warm up vs. my the Slim Ballast kit. I would say they take 30-45 seconds vs the 5-10 seconds for my headlamps. The color starts off as a warm white color and then gradually turns to a true rally car like yellow. Once they are fully warmed up they work perfectly with the headlamps. The 4500k kit in the headlight is great at distance while the 3000k in the fog really brings out the road 20-30 feet from the front of the car.
In summary, I'm really happy with the overall setup. If you live in a wet or foggy area I would highly recommend this setup. I hope to have pictures up in the next week. If you have any questions feel free to post a comment below.
Pictures of the Install...
The picture above show a unmodified fog lamp on the left and a modified one on the right. Notice the difference at the top. Basically you cut off the top connector so that you can route the HID wires out the back.
This picture is indirectly show where I placed the ballast. If you click on the picture to view the larger size you will see toward the bottom center right area two horizontal cuts in the intercooler ducting. That is where I places the ballast. I place the other one on the other side of the car in the same location. A simple zip tie is holding it in place. The down side of putting the ballasts here is if you are lowered and you bumper hits drive ways often you run the risk of damaging the ballast. This is why I recommend getting the Slim kit from DDM Tuning if you do decide to do this upgrade. With the Slim kit you can install the Ballast directly behind or above the fog lamp. If you are wondering, yes I did put lamin-x film on my fog lamps. I went with the smoked color. During the day time the film really help blend the fog lights into the surrounding lower bump.
Here is a front of what the 3000K HID fogs look like. A nice clean yellow just as I wanted it. And yes I did the independent fog light modification.
And here is my 55watt 4500k HID's headlights with the 35watt 3000K HID's.