you can't generalize so broadly like this, South Bay BMW and Long Beach BMW would do any retrofit or mod that I asked, it was just about $$$$. Modding any car is a snap as long as you do your homework first, deal with a reputable vendor and know what you're doing, and if it's not that easy, well, as they say, nothing nothing worthwhile ever comes easy.

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You have your way. I have my way. As for the right way, the correct way, and the only way, it does not exist.