These straight shots are amazing for what they are! Throttle response is great on these stock saws but definitely better with the straight shot. More torque. My stihl dealer was kind of on the fence about them. After toying around with mine, he asked me to order him one for his 500i!! Spikes, air filtration and straight shots on all my saws. Definitely LOUD but they are AWESOME! Wouldn't cut without them.