Well, I've had the K&N in the stock air box, the LPE, and (as of this week) the Volant. No SOTP difference between any of them, although of course both the LPE and the Volant are somewhat less restrictive. The LPE is noisy and ugly. The Volant is quiet and purty. :cool2:
Gotta say, I like the LPE. And with the open air filter, unlike the Volant, the sound says LOOK OUT( Like OJ said on Howard Stern).. Really! the open air filter sounds mean. Unsure about the Volant, I'm only speculating based on the design!