exhaust

So i replaced my o2 sensors with the NGK sensors about 7k miles ago. Didn’t have codes for a while, but just checked it today and I’m pulling codes P0031, p0051, & p0136 (all related to o2 sensors). I’m also pulling codes for p0303 (cylinder 3 misfire) and p0455 (evaporation emission system...

Good evening everyone, I've recently noticed a drastic change in my Jeeps gas mileage from around 15mpg to now 9-10mpg. I'm pretty good at keeping up with the maintenance (no check engine lights), and I know my lift & 35" tires don't help but I've had those modifications on for the past 4 years...

I have for sale a 49 state legal catalytic converter made by Eastern. It was on my Jeep when I bought it, but wouldn’t pass emissions in CA. It did pass emissions in TX fwiw. The cat itself is in good shape, but the piping downstream is rough. Make an offer!

I was wondering if any of you have used the Novak block hugger headers for a TJ Gen lll swap? If so, have they been reliable, leak free and have you been generally happy with them after putting some miles and years on them? So that's the primary question but to expand a bit if you care to read...

Hey Guys, So recently I was on my way home and at a stoplight had a misfire in cylinder 2, and my exhaust sounded funny and fluttery, I was like 8 minutes away so I decided to drive it home and coast down hill. Long story short, I replaced the spark plugs, still had issues. I checked my coil...

For sale is a cat-back exhaust from a 2000 Wrangler TJ with a 4.0L. The complete system is made of stainless steel. The muffler is made by Magnaflow. It has a very throaty aggressive sound. I am building a 4-Link and this exhaust is not compatible with my new suspension. Get this one for a...

Has anyone cut out the resonator in their 4.0? Im thinking to leave the two cats, cut out the resonator and weld in a pipe. This paired with the banks monster exhaust i think could add a little more crackle into the sound of the exhaust. Please let me know if there is any problems with doing...

I bought my 2006 Jeep LJ from a buddy not too long ago and he has it straight piped. After a couple of months of daily driving the droning got to me. Found a 40 series Flowmaster muffler on Facebook and bought it. Cut a piece out of the pipe, used some adapters and now it was bearable....... I...

So I needed to drop my exhaust to get to my oil pan. I separated the exhaust at the flanges just above the Cats and upon re-installing it sounds horrible. What did I miss? Are they miss-aligned? Are there seals/doughnuts that I did not see? Any thoughts?

2001 TJ 4.0L I6 - just put on a Metalcloak 3.5" lift. When putting on the rear passenger shock, it is tight against the exhaust pipe. I drove it 25 miles and the black sheath around the shock melted. How can I force the exhaust pipe toward the center of the jeep to get it off the shock. Then...

Not sure where to put this thread but my girlfriend recently got an Fj because she couldn't afford a JK. lol, I know that's not the answer. I tried to convince her to get a TJ but she says they're too old. Anyway, the Fj forum is crap so I'm going to ask here. I'm getting 3 codes. A P0420...

Hi all, looking to replace some parts on my stock exhaust on my 04 rubicon. People on here seem to like the thrust muffler. My question is, will this particular muffler( part number 17651) slide right into the 2.25" tailpipe and clamp on or need some other modifications? Also plan on removing...

I plan on replacing the entire exhaust system on my '04 with the 4.0, but I'm rather confused as to its setup. I notice on my TJ that the exhaust manifold splits into 2 pipes that converge directly in front of the oil pan, and then head to the catalytic converter. However, with all the exhaust...

Will running exhaust out front of rear tire, degrade the tire, over time, causing rubber in tire to become brittle over time, etc.? like this setup? https://www.buyautoparts.com/data/all_images/17122.jpg http://up.picr.de/1635590.jpg...

When I first purchased my 2004 TJ earlier last Spring (end of March or so?), soon after having it - in the morning, it would whistle. After a few minutes, it would quiet down and go away - and I wouldn't hear it again, until the next morning. Researching it led me to believe it was the IAC...

Hi All, So I'm getting the magnaflow cats and a banks exhaust installed. I noticed on the last road trip that the floor in the back got really warm. Not blazing hot but warm. the bottom of my ice cooler was warm to the touch. Is that normal? Will insulating the exhaust system remedy that? Is it...

What's the difference between a CARB vs. NON CARB compliant catalytic converter system? I have an 06 X with 4.0. I'm considering replacing my cat system with Magaflow system. There are two offerings, part number 93649(non-carb compliant) and 458027 (carb compliant). Does the jeep ECM know if...

Hi, I have a 97 Wrangler 2.5 and recently when I stop or slow down suddenly the rpm will fall below idle. It drops to about 500 rpm. I have read that it could have something to do with the exhaust but I don't want to go tearing apart the engine to find nothing. Looking for a quick fix because...

The guy I purchased my tj from straight piped it and had the exhaust angling down in the middle/rear of the jeep which inturn melted the bushing on the passenger rear upper control arm . So I decided to purchase and afternarket exhaust instead of going factory, and after a little research and...

Need some help I have just replaced my 4.0 with a stroked 4.6 I started it up for the initial run in (20 min @ 2000 rpm to seat the rings) and I noticed that the front exhaust pipe (the one with the little catalytic converter on it) got cherry-red hot, but the rear one did not... what's up with that