Review on K&N Cold Air Intake Kit for Hummer H2 6.0/6.2L V8: Increased Horsepower Guaranteed + 50-State Legal (2003-2009, Model: 57-3037) by Warren Hess

In use for almost a month, no noticeable improvement in throttle response, fuel economy stayed the same. When installing, the nuts and bolts do not match. You'll have to go to a hardware store to get nuts with the correct thread pitch. Overall not a very good price. In fact, the stock air intake for the H2 has a better design and is already a cold air intake. This air intake also produces a loud hiss which is very audible in the car. Not for me. get a refund. I have 2 other trucks with the same K&N air intake and have been happy with the results, albeit for the H2 stick with the stock system.