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Old February 15th, 2008, 07:56
NAXJA Forum User
Join Date: May 2004
Location: Des Moines, Iowa
Posts: 4,647
Re: 0331 head swap, mpg change?

Originally Posted by indy_xj
Thanks for the reply.

But according to your sig, you have a 3" lift and 31s. Mine is completely stock. I would hope for slightly better milage than something that is lifted.

Mine had federal emissions, not cali (only the '01 were ALL cali emissions) I have the standard 1pre-cat, 1post-cat O2 sensor and only the main exhaust cat.

Okay, you're right, I do have about a 3" lift and 245s which equal out to be roughly 31"s. To tell you the truth, I'm not sure if that much lift affects a whole lot, but it may. I thought all '00s and '01s had the triple cat system so thanks for clearing up that confusion. That's about all I can tell you, but I would really suggest that it might just be because your Jeep is more or less using a 99 setup now, except the coil pack rail. Hopefully someone else will have insight as well that has actually done this, that's just my guess.
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