Too bad. So did you try the pumper with your IMS tank? and if so did it fit or require modifications?
My bike is a 2010 Dynojet Stage 2 jetted, with a Muzzy exhaust and no air box lid. The 331 kit is on order and I would like to get a pumper next. I saw posts that showed issues with Clarke and Acerbis tanks so that's why I am wondering if my IMS will be an issue.