Been working on this setup all spring. Bought the blower new on here in November. Started making this noise after a few street miles. Only starts making it after it has fully warmed up after reinstall. Pulled the blower TWICE and checked idlers/replaced the factory idler. Two different tensioners.. Impeller looks good.. Has to be coming from the gear box.. The part that really burns me is I emailed Vortech Warranty department and have not gotten so much as a reply in two weeks.. Good way to piss off an already mad customer.