Join Date: May 2009
Location: The Republic of Dave
I'm not questioning whether or not it restricts airflow, but whether it can improve the airflow so drastically over the stock system...which, according to a LOT of threads on this forum, it can't. Every bit of solid information that I can find says that the stock intake system is more than adequate for the 4.0's air requirements. Thus, any extra air the cowl intake can bring in...isn't needed or used. Furthermore, since the computer doesn't know what intake is feeding the throttle body, it can't adjust to it. Speed-density computers calculate air intake from readings of air pressure, air temperature and the position of the blade within the throttle body...so changes to the intake will have no real effect.
Now, if we're moving the intake to make room for something else under the hood...well, that's cool. Go for it, says me. I just don't think that it gives noticeable power...certainly nothing detectable without a dyno test.
P.S. If all it took was a cowl intake to increase mileage by 1 to 1.5 MPG, do you not think that Jeep would build them that way and advertise the hell out of it?
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