I have ST170s too, I know what the cutoff looks like. But when you add the extra light that comes with HIDs (which the reflector housings weren't designed for by the way) you get glare that leads to oncoming traffic being blinded. To put all that light to good use, you need projectors which in your(our) case would mean a retro-fit. Or buying lights with projectors. Do what you wish, that's just my 2 cents
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