Additional slots on both sides & enlarged openings at the bottom to allow more air to enter the sides of the K&N filter. End Breather Technology - We added a large, round foam filter element beneath the teardrop center cover to allow filtered air to enter the end of the filter.
The Twin Velocity s internal crankcase vent system has been designed to direct gasses & oil droplets into the carburetor or induction module.
All these improvements add up to improved air flow & greatly improved power potential.