As mentioned in another recent thread, the DDM kits are not "upgrades" to the stock system. The stock HID setup is far superior. If you want a different look, buy hotter/cooler bulbs.
That being said, I have had great luck with DDM kits/bulbs. I run DDM bulbs in my Z now, but I would never change the stock ballasts to their kit. No point.
The stock wattage is 35 watts btw. If for some reason you still feel the need to change the ballasts out, go with 35w.
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