So i want my exhaust to sound like this.
On the video he has no cat. and 2.5 in pipes until the bends over the axle where it goes to 2 1/4 for a tighter bend. So the question is if he is running no cat isnt your oxygen sensor in the cat. And without the oxygen sensor i would get horrible mpg and run rich. Should i do it and is there anyway to make the oxygen sensor read as if its in the cat but it actually isnt. By the way i have a 1998 Cherokee.

 

you dont have one in your cat or after your cat.. yours is before the cat.. and its illegal to run without a cat in alot of states idk about yours but it is.. and why dont you just get a highflow cat and run a straight glasspack out the side.. maybe buy some nice headers or something if money isnt a problem

 

i live in Illinois and we dont have emissions testing.

 

alright well then run straight to a glasspack out the header i bet that would sound really nice

 

im going to run the manifold into a 2.5in pipe then to a flowaster super 40 with a single offset inlet and dual outlets then out the outlets into 2.5in pipes then narrow down to 2 /14 in pipes and out the back.

 

sounds good to me.. hope it works out good

 

98 is OBDII which will have a o2 before and directly after the cat....Dont remove the cat..replace it with a High flow.

 

I live in IL too. I didn't know we don't have emissions testing. I am getting new exhaust so idk if I should even bother buying a cat now.

 

with your OBDII jeep the lack of fuel milage and performance due to removing the cat will cost you more than just buying a high flow.....Bottom line you need a o2 Simulator for the rearmost o2 if you plan to remove the cat.

 

It will depend on where you live in IL. I live in Grundy and we don't have them, but I know other countys do.