Best HID kit for Spec D boomerang headlights?
 

Best as in easiest for installation. I am currently using my stock halogen bulbs, but want to switch to HID's, not really sure which kit to purchase for install.

Consider getting in touch with https://www.theretrofitsource.com and asking about a projector replacement.

Here's their retro-quick setup for Spec D lights:

https://www.theretrofitsource.com/projector-kits/retroquick-kits-vehicle-specific/morimoto-retroquik-spec-d.html

I got in touch with them. Chat, phone, and even the founder of the company told me to get the quick kit made for the spec Ds. Theyre 90% the same. Well apparently the ones for our twins is the 10% They Don't carry the the bracket for our spec Ds.

What about LED? That's the easiest to install. I had VLEDS Micros in my RX-8, I converted from HID and they seemed a bit brighter to me (they are advertised as having the same output as HID).

http://www.vleds.com/shop-products/led-headlights.html