I was wondering if every one could clarify which AXE motor they have IE whether it's modded or not, and are you using the pipe that comes with it or something else. I am getting ready to buy this AXE ROSSI 21 COBRA VP HOT MOD w/TUNE PIPE to run in a XRAY XT8 , I want fuel economy is why I am going with the .21 but will it push the truggy around the track effortlessly. Thanks for all honest oppinions.