It shouldn't, but then I guess it's down to the examiner, but that's years away, and with the talk of the MOT being scrapped it might not even be a problem.
I've had two bikes with HID fitted, and although it was better, nothing beats a good beam pattern. So if the OE headlight has a good spread, just change the standard bulb to something like a crystal vision or a night breaker and save a load of dosh and grief.
You also have a problem with HID when going from dipped beam to high beam !
I really like mine... Chad at AHR did a awesome job on this one. He also change the 2 running lights for amber LEDs and they are running/signal lights too.
Not sure. I buid an midship exhaust for Chad FZ1 on a killer deal in return of future services. Contact him and he will answer all your questions. (Rabbitman)