The CF might be a bit lighter, but I'd take the FLM chassis over it anyday. I say this simply because a Stampede is usually a basher and the FLM chassis is likely to hold up better under abuse...not to mention FLM has an awesome warranty.
ya u was wonderin becuase i know the fastlane machine is lighter then stock but i would imagine the carbon fiber would aswell. i bash all the time so ill probly go with fast lane but sometimes like some carbon fiber:027: .
If you bash, I suggest the FLM just due to the warranty they offer. It's also nice having a bit longer chassis (if you buy the extended chassis) to help with the handling of the truck.