Yes Significantly. When i put it on i picked up a hige amount of Supercharger whine. But ever since i put on the long tubes,the whine it seems to be not there anymore.
I don't have any specific numbers on it as I added lot of other parts at the same time, sorry. I'm currently at 346rwhp // 340rwtq with a Series2 right now and hope to get that torque number up. Stock pulley, although I see up to 11.5 psi if I take it up to 6000rpms.