An exhaust is considered the best hop up part to add first on a 2 stroke. They will run with a stock motor. You may experiment with your needle setting a bit to correct any rich or lean condition. I am not familiar with the "Torquer II". The SickBikeParts exhaust is supposed to be very affective and can be adjusted to fit a variety of bikes. Some members say the Banana pipes and Long Poo pipes are just for looks and don't really add perceptible power.