only a 30% increase in performance with the hpi k4.6 engine........not realy a big increase.....with the extra 200 bucks u gotta fork out for that system you can buy an even better engine and a nice pipe and get better performance.....
and these things make the engine runs outragiously LEAN....wich aint good
FG leopard comp w/Trevor Simpson 28.5 bzm crank
HIP Baja 5sct
AE tc5 3.5t speed monster,Futaba 4pks
Raptor G4 ,Raptor e550,Gaui x5,Mini titan v2,Precision aerobatics bandit 4s monster,Carbon z scimitar Jr 11x