Originally Posted by HidSolutions

Retros will be your best bet if you want to do it right but be forwarned they can be expensive especially for needing someone who could fabricate a kit or just install on a sienna. I sell plug and play HIDs if you want some info. They will not have as good cut off line as with projectors but if your not looking to spend the upwards hundreds to a grand or more this may be the option. 5ks will give you nice output with extreme white color. 6ks I would say are the nicest color/output compromise. Any higher and your giving away too much output for wild colors. 6k for that "hid" color, 5k for a good solid white not the ugly halogen color with good output. Hope this helps and I know of a few people who retrofit from clubrsx.com very clean work affordable for the kind of work.