The DDM relay is a basic relay that comes from DDM tuning, prewired and fused to use for headlights. It uses the existing headlight wire as a trigger, and pulls power from another power source instead of through the headlight switch and old, puny, factory wire harness. I have mine ran to the under hood fuse/relay center auxiliary power. If your headlights are blinking, it's likely because they aren't getting enough power. The relay should fix that.
TRS is theretrofitsource.com, they sell projectors along with everything else needed. Quality is high, but so are their prices. That's why I like the idea of using the high quality projectors with cheaper bulbs and ballasts. If the bulbs or ballasts go out, they're still dirt cheap to replace assuming they're even out of warranty. You get a top quality beam pattern, while saving money on the stuff that isn't as important; for example the color temp being slightly off or your lights taking more than three seconds to warm up. TRS has a TON of info on their site, they've got several videos up on youtube helping to explain the basic stuff as well as installation.
