For those with an 09 CVO or Cali touring models, this is an interesting link on how big those cats are. Fulsac now providing a service to remove the cat in the headpipe. Fullsac Performance - 2009 Headpipe Modifications - Lake Havasu City, AZ I've heard they also have a new headpipe using OEM heat shields if you want to install the OEM headpipe w/ cat back in if something comes up. Jackpot also is producing a new headpipe, using OEM heat shields. Jackpot 2/1/2 Headpipes I think folks with a non-cat headpipes only seeing minimal increases switching to these new "X-piped" headers, but those switching from a cat headpipe seeing 10+ hp/tq. Have fun and ride safe!