I think someone had shared this video a year or two ago, but I don’t see it anymore. I had done this for my fan so I thought I would reup this K40 Stock fan mod. It definitely increases the efficiency of the stock fan, not huge but is noticeable. After adding the spacer on mine I had to grind down the shaft hole on the squirrel cage to expose enough thread to get the nut to grab on. Just used a coarse sanding drum on the dremel. #K40Exhaust
