LRD or factory7 pipe would be the best, my LRD unleashes hell on anybody i race. FMF and DG have been proven to be the worse pipes out there, sure they make them a little peppy but they suck. if you are thinking about getting a race pipe for mx, beware they are loud! really loud but if you ride on your own property there is no noise level requirement, i ride on private property with permission and the owner does not care about noise levels. i would say go for LRD they sound really good and they got good performance.