Complete waste of money on a 4.0L engine, at least in my strongest possible opinion. I've had two, both given to me for tests and neither made a noticeable difference. And the couple of local Jeepers I know that tried them said the same thing.
With the airaid intake, poweraid spacer, and cut off cats with a flowmaster, it made a hell of a increase in gas mileage, and alot of lower end torque on my 4.0. But also running the Hypertech powerprogrammer as well.
I've read a lot about the throttle body spacer having no effect due to the fuel injectors and air flow regulator offseting the effect of improved air intake. Is this only true on the 4.0? Will there be a benefit for the 4 cyl engines or is it the same physics.
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