cant wait.....got a 07 speed6 black on black......just got a cold air intake and tomorrow im getting a blow off valve......but one question does a blow off give any horse power some say yes and some say no?
Technically, you don't gain any HP from a BOV / BPV, but it has been proven that the stock disi unit is leaking for some people. If your stock plastic valve is leaking psi, and an aftermarket unit gives it back to you, then yes, you will feel a gain...
There is no "technically" to it.
He may actually show a dyno proven gain...but if its due to a faulty, leaking part..then no..It does not add.
It may allow things to run better and actually increase the power...but that power ws there the whole time.
It just wasn't getting to the ground.