Niobium is correct with The boost being vented to the atmosphere versus putting it back into the intake track is much smoother on the throttle transitions on and off the throttle. Absolutely the way to go to make this bike smooth. I would absolutely rather lose one horse power and have the complete rideability that I have now.Its opening lower in the rpm range in the off / on throttle transitions. Much smoother. The stocker vented more aggressively at a slightly higher rpm range. Directly off of the throttle bodies is smoother by virtue of it not relying on the solenoid to determine the blow off openings and closings. The stock setup is really great for passing emmisions tests, but not the best for linearity of response or smoothness in venting lower amounts of boost from lower operating ranges. These are the ranges of maintenance throttle for a corner carver. Makes a fantastic difference and sounds lovely to boot.