I've done other retros using all kinds of projectors but nothing else comes close in terms of output for size and ease of installation-especially considering that these are bi-xenon. For STI guys the D2S versions bolt right in using the available adaptor plates. Only two wires to hook up and one tiny hole(5/32") to drill after opening your lights, of course and you'll have bi-xenons. If you don't like them take them out, seal the hole you drilled and go back to stock.
More expensive than a cheapie PNP yes-but far superior.