[zoth]

Originally Posted by gmsii

The solid answer is that the factory check valve does leak .....but it doesn't leak enough to affect performance
At KW we tested the check valve and it leaks ever so slightly at approx 7psi but the amount of air that leaks through is roughly the same at 7psi all the way up to 90psi.
We tested the KW kit with both the factory check valve and a heavy duty check valve and there was no difference in performance/horsepower
The are those that freak out over the idea of having a 'boost leak' but the reality is that the leak has no perceivable affect on boost ....just as a pinhole leak in a bathtub wouldn't have a meaningful affect on the overall volume of water in the tub.
So the definitive answer is .....change it if you want, but you don't really need to

ps.....for those that are freaked out about leaks... Did u realize that your wheels and tires leak air also?

@KraftWerks not an expert as you guys, but we are talking about the check valve being recommended to be installed between the PVC valve to the intake manifold, right?

Please see attached... Thanks in advance if you guys could clear this up.