Not sure there would be a very big market for performance parts for the GL1800 models, though there is a huge market for non-performance add ons.
IMHO, people who bought the full dress wing, did so for what it offers, huge trunk, all sorts of touring related "stuff."
Those who bought the F6B, did so for the same reason, they wanted a model a bit sportier and did not have the need for all of the creature comforts.

You want performance, grab a VMax, or, better yet, get a Kawasaki Ninja H2R, probably no need for more than 326 horsepower on two wheels.

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