exhaust

  1. Natethegreat202

    Loss of power/acceleration after new catback and manifold? Clogged Cat?

    Hey all! Thanks in advance for all the help as always! 1998 4.0 manual transmission with 96k So here’s the scoop! For about the past 9 months my TJ has had an exhaust leak. First was the flange. Tightened that up and it helped. Slowly got loud again but not crazy loud. Finally this past...
  2. Natethegreat202

    Should I change the entire exhaust or just the muffler?

    Hey awesome Jeep peeps! As always wanna thank everyone for all the awesome tips! This forum is a godsend. Underneath my TJ today (1998 4.0 manual trans) I noticed a crack in my muffler. Did some research and am pretty set on getting the bank’s monster exhaust! the muffler and tailpipe. My...
  3. Lorenzo Altarocca

    Exhaust work upgrades on 4.0

    After found a big crack in the exhaust manifold (4.0L 1998) I decided to upgrade the exhaust line with: Replacing the manifold with a new one, with flexible joints; New bolts set & Fel-Pro gasket Wrapping the manifold with a really good quality Aeroflow exhaust wrap to reduce heat up to 70%...
  4. TreverStevens

    V8 swap exhaust

    Wrapping up my Magnum V8 swap finally and starting to look at what I want to do for an exhaust. From reading and watching things around on the internet a lot of people say a 3” exhaust does the Magnums well, but didn’t know if that would make much of a difference with the TJ’s shorter wheelbase...
  5. Irohk

    Magnaflow off-road pro is a bit too loud on the inside

    My stock exhaust was giving some trouble so I decided to swap it out with a Magnaflow off-road pro exhaust. The new exhaust sounds really great outside, however on the inside it's a bit too loud for me. I wanted to know if anyone has any suggestions on how I can reduce the noise on the inside. I...
  6. ChestnutHill

    SOLD MBRP stainless steel exhaust - brand new

    I installed this brand new MBRP system and it’s very nice- great fit and finish, but it’s louder than I was expecting. I replaced it with a milder Flowmaster Force II system. This exhaust has less than 30 miles on it. It is listed for $250 on Extreme Terrain. Asking $200 shipped. Ready to...
  7. PKJones4

    Cat back exhaust options for 06 LJ?

    Howdy! I have to replace my muffler/exhaust pipe in my 06 Rubicon LJ and was having problems finding a good selection of cat-back exhaust systems that were in my price range. My friend put a Flowmaster in his JL and I liked the sound/look, however, I have found TONS for the normal TJ but no...
  8. Ryan41

    exhaust manifold and catalytic converter replacement

    Hi guys I got a 99 with a noisy rattling cat so i was looking to replace it. Before i order my parts i was looking into where it mounts to the manifold and that didnt look in too good of shape. so I started it up and stuck my hand up there before it got too hot and sure enough on one of the...
  9. PenelopeTJ

    Thoughts on exhaust noise

    So as a young guy who likes to be loud and party I decided it’s a good idea to get an exhaust system. I’ve decided to get me headers, cut the cats off, and then I still have no clue if I want to cherry bomb it and have the tip end off to the side or if I want to get either a muffler/ resonator...
  10. NYC-TJU

    Lifter Tick or Exhaust Leak?

    Hi all, So I've been searching the forums for an idea but haven't seem to have found my scenario yet which is as follows: (1999, 4.0, 225K+ miles) When i start the jeep when cold, until it gets to temp there's a tick that seems to be relative to RPMs. So, constant tick-tick-tick speed while...
  11. N

    Bad catalytic converter or o2 sensors?

    Hey everyone! First time posting here and am hoping for some advice. My 14 year old son bought a 2006 TJ. It's a manual 2.4L and runs great but we are slowly repairing varies things along the way before he gets his drivers license. The error codes we're receiving are: P0420 P0456 P0137 P0138...
  12. minimull

    Exhaust routing for future tummy tuck

    The PO of our LJ removed the third cat (yay) and stock muffler to install an obnoxiously loud glass pack (boo). The exhaust needs work anyway as it’s already been bashed in by the front driveline. I’m going to see if they can add a flange in the y-pipe (to make removal for rear main seal...
  13. 00TJOH

    2000 Jeep TJ 4.0 exhaust options

    Hello- I was tired of the rattling my old rusted exhaust was making so i broke out the sawzall and cut the exhaust in front of the cat converter. so my exhaust pipe is just stubbed out before the skid plate. My question is, Until i can get it to a shop to weld on new pipe and muffler, what are...
  14. Spencer C

    Codes after replacing o2 sensors Cats

    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...
  15. Jmazza0

    Cracked Exhaust Manifold?

    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...
  16. Pullski

    California 49 State Legal Catalytic Converter

    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!
  17. Oreyca

    Novak block hugger headers for a Gen III swap?

    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...
  18. Mitch8801

    2002 Jeep Wrangler TJ with glowing red cats

    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...
  19. TJustin

    SOLD Magnaflow Stainless Cat-Back Exhaust

    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...
  20. Trev’s 06 Rubicon

    Exhaust Resonator Delete

    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...