Otakuinajeep

Following this with a question out of curiosity. under Cali emissions (requiring the pre-cats) if someone wanted to for whatever god-forsaken reason go with a dual exhaust after something like Banks Torque headers so it's split 3 and 3, could you fit 2 single pre-cats instead of the 2->1 on the jeep or is this setup necessary in some way for passing emissions? Understandably you'd be throwing cash away by doing this when requiring the main cats and muffles on now 2 lines instead of 1, but for the simple reason of "why the heck not?" could someone do it?

DrShaggford

as long as you just cut the Y portion of the pipe you should be just fine. All 4 of the O2s are North of that part and anything after the O2s shouldn't really affect them. Unless you did something real crazy that caused negative pressure at that point, and even then I'm not sure it would really affect it.

Basslicks

Only drawback I see with this is that you would then have to add ANOTHER cat to pass emissions. So you'd have a total of 4 cats and 2 mufflers, instead of 3 cats and a single w/ dual exit OR dual mufflers depending on which you decide to go with.

I'll say this much though, running a true dual setup will be challenging being as the transfer case is in the way on the driver's side.

josh01jeep

i was looking at flow master 44 for my 01 xj. i want a to have a loud and nice tone that loud but not ridiculously loud. anyone have any advice??

Basslicks

Try this thread man.... https://www.cherokeeforum.com/f67/ch...thread-180356/

Has a lot of clips of exhaust setups so you can hear how they sound.

esteem

After taking a glance at this, I'm wondering how I have passed smog before. I'm in CA and have banks headers, followed by one cat and then a Magna flow exhaust. Should that be smog legal in CA? I have a silly sticker from Banks slapped on my firewall that says it's "approved" in legal language but if that is all it takes to pass visually, the system is seriously flawed...not that I haven't felt that way already.

jessikuntz

just bought jeep. Not even tagged yet..Noticed something new today.


What to do? Weld? So-called "muffler tape"? Replace?
Also theres big sections throughout the entire exhaust that are blackish. Like its charred.

Basslicks

Muffler tape is a no-go. Stuff is only for holes in the muffler and only a temporary fix... won't do a darn thing on a joint like that. You can either weld it, or replace it. If you have the money, add a flex joint somewhere inline between the cat and the flange for the manifold. That will relieve stress on the exhaust manifold and keep it from cracking again.

Danger12

The PO of my XJ had upgraded the ehaust. I found out the muffler is a flowmaster 40 Delta flow but I can't find anything to identify the cat. Any way to identify it? The cat has some knocking and rattling going on inside of it when I first start it sometimes. Once it warms up it goes away. Any idea what would cause the knocking noise? Think it needs replaced?

Basslicks

I don't know of any way to identify it, but if there is knocking and rattling in the cat, it's because the platinum has broken loose. I would replace it.

Here's a reputable site that sells cats of all kinds. I would recommend the magnaflow 4300 series. Doesn't take up a lot of space, and it's good for motors up to 4.2 liters.

http://performance-curve.com/catalyticconverters.aspx

madmanmarty

Hey danger, Basslicks is right on the money.

JSJJ388

Ok, I am thinking about putting a thrush glass packed (cherry bomb) on my ZJ. I have one on my truck which is 3.9 v6 so should it sound pretty much the same?

Danger12

Thanks for the info! I looked and I actually live about 45 minutes from performance curve so I will have to ride over there one day. If my cats platinum is broken loose, would that not affect the O2 reading?

Basslicks

I'm not sure what you mean by "Not worried about emissions as it is pre 95." Federal emissions standards began on all vehicles manufactured after circa 1972... so your 95 XJ (all XJs for that matter) is still bound by federal emissions.

As far as what it will sound... no, it will not sound like your 3.9 liter v6. Straight 6 motors have a completely different exhaust sound versus a v6. Straight pipe a v6 and (in my opinion) it sounds like crap... straight pipe a straight 6 and it has a sound between a tractor and a cummins.

All that being said, head over here for exhaust sound clips for a better idea on what X muffler will sound like.

Right on!

IIRC, there is no 02 after the cat (I KNOW there isn't one on OBDI motors.. can't remember about OBDII), so it won't effect the O2 reading, but it will potentially cause a clog and wind up damming the heat at the cat and upstream. Best for you to replace it for sure.

JSJJ388

[QUOTE=Basslicks;3318261]I'm not sure what you mean by "Not worried about emissions as it is pre 95." Federal emissions standards began on all vehicles manufactured after circa 1972... so your 95 XJ (all XJs for that matter) is still bound by federal emissions.

As far as what it will sound... no, it will not sound like your 3.9 liter v6. Straight 6 motors have a completely different exhaust sound versus a v6. Straight pipe a v6 and (in my opinion) it sounds like crap... straight pipe a straight 6 and it has a sound between a tractor and a cummins.

All that being said, head over here for exhaust sound clips for a better idea on what X muffler will sound like.


We do not have emissions inspections on pre 95 vehicles in NC, only a simple safety inspection.

Thanks, ill check those out!