DragonFire Racing Dragonflies 857 kit installed April 16, 2015 I’m just installed the dragonfire 857 kit in my rzr800s. I have a full HMF exhaust with HMF optimizer, clutch kit, filter. Now the question is does dragonfire or anyone reflash ecus and or have good settings for the optimizer? Thanks in advance Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related