IMO the Fire 11 and FMS are not timed properly for North American tracks....exhaust timing is too high and so is exhaust blowdown....this makes them very top end oriented and less punchy then I like them.... I modify these engines by reducing exhaust timing and reducing blowdown timing...Which gives them all the bottom end you could ever want...Then with changes to the engines balance I still manage to pull a big top end
video evidence of mod Fire 11...no BS or hearsay, actual video !
And here is video of modified FMS...modified to increase torque and make engine more useable on the track...A FMS with actual bottom end !