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I have one under the stock derby cover. Adjusting the clutch becomes a little trickier, a offset box end wrench won't clear the vpc. I use a 11/16 deep well spark plug socket. I can put a wrench on the end of the socket and slip a long hex wrench down the middle.
I also have the AIM VPC under my stock derby cover. No problems whatsoever and the clutch operation is great. I also went with the standard clutch spring for a 2003 model big vtwin.