Novak Conversions Jeep Wrangler TJ radiator

2004 Jeep TJ 4.0 Exhaust System

Skyhawk

Member
Original poster
Joined
Sep 5, 2023
Messages
33
Location
Mineral Virginia USA
I have a 2004 Jeep TJ 4.0 with exhaust issues. I recently spent a lot of time removing the intake and exhaust manifolds and replaced the gaskets. I replaced all of the mini-cat nut plates on the manifold and all was good for a while with a tight exhaust system. The jeep sat in my garage for about 3 weeks and I started driving it this week and now I am getting a CEL for catalytic converter inefficiency (don't remember the code) which is pointing toward replacing the cat. I have new oxygen sensors installed on the mini-cats (Chrysler OEM not aftermarket). Seems like every time I turn the key on this jeep it's a new problem. I think it was driven in salt water at some point, and the frame washed down, but not the rest so well. I am looking at probably replacing the whole system, since the muffler is heavily rusted, but the mini-cats look OK. I dont think the cat is in very good shape... prior owner probably didn't get the salt water rinsed off very well.

I have been looking at exhaust systems and the price is all over the place. I am looking for just a stock system replacement that doesn't require any modifications to install and works well. Any recommendations on a descent system with a good price point??? (I do not need a California/Colorado/New York CARB compliant system.)
 
Im interested in this as well. I think the cats on my jeep are somewhat clogged. Price for them is insane from what I've seen. I think you can remove the third cat but if you remove the first two you will always have a check engine light on.
 
I have been looking at exhaust systems and the price is all over the place. I am looking for just a stock system replacement that doesn't require any modifications to install and works well. Any recommendations on a descent system with a good price point??? (I do not need a California/Colorado/New York CARB compliant system.)

Im interested in this as well. I think the cats on my jeep are somewhat clogged. Price for them is insane from what I've seen. I think you can remove the third cat but if you remove the first two you will always have a check engine light on.

https://wranglertjforum.com/threads...lytic-converter-kit.79706/page-7#post-1601923
 
Novak Conversions Jeep Wrangler TJ radiator