We sell the Airaid
Throttle Body Spacers, usually along with an intake. Most of our customers agree that there is a noticable increase in torque from the combination. However, we have also received the feedback that after a while, a month or two, that the computer actually re-adjusts itself to compensate for the aftermarket products. At which time both the power and mileage gains are lost, in theory anyway. I have heard that disconnecting the negative post of the battery overnight will reset the computer and get the improvements back again. I stress that this is all in theory. In our 2007 Wrangler Unlimited Rubicon, the improvements have never seemed to diminish. However, we don't drive it a whole lot and with 37's who is checking gas mileage?