I got a xl, broke it in adjusted high speed needle runs aboat 230 taking with losi temp driver. It rips comparied to my dads 2.5 t-maxx or my buddies 3.3 it just doent seem to hit like the ones I've seen clips of. Ex. it wont wheelie of stand still. Oh yeah I'm using 20% nitro 16% lube byron fuel and I'm on about my 7th tank.