I had Jeff build me a complete 4 mil, 35pwk, and his dune port, He said he did an agressive dune port due to the way I ride( fast trails and dirt roads ). He also ported the cases. I run cpi inframe drag. So all in a nut shell it gets violant when I get down on it. Scared the piss out of me the first time out, I've givin people rides on it and you can't tell you have that extra weight there, it just helps plant the tires for traction. You bet I'll have Jeff do more porting later on some cubs, I'm real happy with it. You can't go wrong.