Oh, I didn't get to drive it today...had to take care of some personal stuff. I mean the z-tube is pretty good. You noticed a little bit stronger intake noise when it approaches 3500rpm+. On local streets or suburban street, take it up to 2nd gear to about 5,000rpm + and let the rpm ride back down and you'll hear alot of humming noise. On highway you won't notice the z-tube much unless you downshift and let the rpm go high. Overall, it's a pretty good upgrade for an affordable price. You can't go wrong. It's also easy to install. Go for it.