Our son drove ours 447 miles back to school Saturday.....averaged 22.1 mpg doing 70-80 mph. We do have a CEL and will be installing a simulator to turn it off.

 

For the posters without cats, read the sticky at the top of the Cherokee tech page.


I'm getting my whole exhaust redone because whatever the PO did, the welds are very porous. I'm planning on getting 2.5" pipe, regular cat and muffler (getting tired of all the noise)

 

dont take this the wrong way. a friend of mine got a ticket for "modified exhaust system" because it did not turn out from under the car. dumped out like the pick. maybe just FHP having to meet a quotta or something.

 

Yep, good point. We were a little rushed for time so the plan is to order a mandrel bent 180 and 90 to exit out the side in front of the tire.

 

dont know where you live, but here it has to "exit behind the passenger compartment" which, for a cherokee means you have to have it go all the way to the back (stock location)..
I dont think its enforced too much around my area, but I dont know about you. Mine exits under the back seat...

 

I'm in alabama and I've has several vehicles with the exhaust stopping before the rear axle and never got a ticket or pulled over. I DID however have a friend get a ticket because his trucked smoked out the tailpipes too much lol

 

A unibody vehicle should never have the exhaust dump beneath the vehicle. Toxic fumes can come into the passenger compartment when idling.

 

The setup you are going for is gonna drone like sum *****! As already posted...you will lose so much from no back pressure. It's a straight six..not a V8! It might end up sounding kinda ricey! I did straight pipes on a V6 with no resonators, 2.5" pipes and lost a ton of HP and torque. Ended up tearing it all off and just throwing a flowmaster 44 on it with resonators. It still had a really harsh drone at highway speeds.

Try just changing the muffler and header first ...see how you like it. You would see some mild gains in HP from these 2 changes.

Just my 2 cents!

 

Yea I decided to go with a flowmaster (not sure which one yet) and 2.5" exhaust pipes but i'm not sure where it's gonna end up coming out at tho

 

Make it come out the back. If you take your Jeep offroad at all...having it come out infront of the wheel or drop down...it will get torn off pretty quick.

 

that's what I got to thinkin about that's y I hadn't made up my mind yet as to where I was gonna run it out at. Thanks for the input guys