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I tried it on my camaro with a huge cam in it that makes it have a horrible idle. I just covered the exhaust tips and left a 1" hole. The idle was way smoother and the car felt much smoother when I left on my way to work. I blew them off the car on the way to work though so I have no idea how much it actually helped mileage. I do know you could actually stand around the back of the car with it idling and normally it would choke you to death if you just walk by it.
If the weather would warm up I would really like to try that again and this time clamp them on much tighter. That car would be the one to show the biggest improvement I figure since it gets horrible mileage normally.
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