New cat?

ObiHann · **Posted:** Thu Dec 25, 2008 10:32 pm

I was thinking about upgrading the cat on my KJ since I just did the muffler, and I noticed this, any opinions?

http://www.car-sound.com/02product/disp ... rsal=14106

Any recomondations? I run the flowmaster super 44 offroad if it helps any.

Diggerfreek · **Posted:** Thu Dec 25, 2008 10:40 pm

Wouldn't even dream of it. Your kj will never pass emissions. First the cat may not clean the exhaust gasses like your oem one and second, here in Colorado, a certified emissions facility can only install it, and at that, i don't think they would do it with a warning like this
NOT FOR SALE OR INSTALLATION ON POLLUTION CONTROLLED VEHICLES IN CALIFORNIA.

ObiHann · **Posted:** Thu Dec 25, 2008 10:43 pm

So what are my options for something that will be a bit more... street legal?

Diggerfreek · **Posted:** Thu Dec 25, 2008 10:45 pm

what is it exactly that you are looking for from your exhaust?

tjkj2002 · **Posted:** Thu Dec 25, 2008 11:53 pm

You do know that there are 3 cats on the '02 KJ's right?

Fulltimer · **Posted:** Thu Dec 25, 2008 11:59 pm

I suppose it depends on the laws up there in Canada, not California.

Terry

RAYMAN975 · **Posted:** Fri Dec 26, 2008 2:39 am

tj, theres one on each header downpipe up closer to the engine, and one more before the transfer case, then theres the resonator, and muffler, correct? i havent been under there for a long while, i forgot haha

jeepkj02 · **Posted:** Fri Dec 26, 2008 10:57 am

RAYMAN975 wrote:

tj, theres one on each header downpipe up closer to the engine, and one more before the transfer case, then theres the resonator, and muffler, correct? i havent been under there for a long while, i forgot haha

No resenator on the KJ.

ObiHann · **Posted:** Fri Dec 26, 2008 4:37 pm

Unless I missed something when I was last under it, I see one cat right before my muffler... And what I'm looking for? more air flow, the ilusion of more performance, the illusion of a deeper more defined sound, and most importantly, a project. So lets not talk about the benefits, and lets just talk about what needs to be done pleaseeeee

KY Liberty · **Joined:** Sat Jul 09, 2005 1:46 pm **Posts:** 1195

You missed something, or actually 2 somethings. Follow from the exhaust manifolds and you will find 2 more cats before getting to the 1 you found. Good luck getting anyone to touch them if you have less than 80k miles or 8 years on them. I'm at 76k and 7.5 years right now. I've got a set of headers sitting in a box and I will be getting the cats replaced with high flows very soon.

ObiHann · **Posted:** Fri Dec 26, 2008 7:20 pm

So why so many cats? This might be stupid, but when I look at cat back systems for the KJ, there seems to be a cat and a muffler, not 3 cats and a muffler?

KY Liberty · **Joined:** Sat Jul 09, 2005 1:46 pm **Posts:** 1195

As far as why 3 cats, just go with that's how they designed it. If you have enough miles or age on the cats, or there is something wrong with them, you can replace them, but you can not just remove them. That's a $2500 fine each for federally mandated emissions equipment. If you want to get more air through it, I don't know how much help higher flowing cats will give you alone. I've got a Fastman throttle body and machined and polished heads to help mine inhale some more air.

tjkj2002 · **Posted:** Fri Dec 26, 2008 10:30 pm

ObiHann wrote:

So why so many cats? This might be stupid, but when I look at cat back systems for the KJ, there seems to be a cat and a muffler, not 3 cats and a muffler?

Cat back systems do not include any cats,hence the name "cat back" which means from the cat back to exhaust tip.

Here is a pic of the other 2 cats your not seeing,circled in yellow.

RAYMAN975 · **Posted:** Sat Dec 27, 2008 2:57 am

your not supposed to legally replace the cats unless theres something wrong with it, or if it has under 80k on it? wow i didnt know that!

ObiHann · **Posted:** Sat Dec 27, 2008 8:26 am

tjkj2002 wrote:

ObiHann wrote:

So why so many cats? This might be stupid, but when I look at cat back systems for the KJ, there seems to be a cat and a muffler, not 3 cats and a muffler?

Cat back systems do not include any cats,hence the name "cat back" which means from the cat back to exhaust tip.

Here is a pic of the other 2 cats your not seeing,circled in yellow.

So then what is cat bacK? How cant they not have cats, thats illegal? Do they just use stock cats? Whats the point?

Diggerfreek · **Posted:** Sat Dec 27, 2008 12:58 pm

a cat back is all of the parts behind the cat

tjkj2002 · **Posted:** Sat Dec 27, 2008 8:28 pm

Quote:

Whats the point?

To keep things federally legal.

scrambledKJ · **Posted:** Sat Dec 27, 2008 9:17 pm

to answer your original question, I have used dynomax high flow 3-way cats when I made my scrambler smog legal. They flow awesome. I have true duals, and one on each pipe kept me legal running a 4bbl holley on a straight six motor. I also put one on my friend wrangler with a 4.3 and a sigle exhaust. His smogged fine too.

Travis

Guest · **Posted:** Sat Dec 27, 2008 10:38 pm

A CJ8 is not held to the same emissions standards as a modern vehicle.

And how do you have true duals on a 258? 3 primaries for each collector?

DryBones · **Posted:** Sun Dec 28, 2008 11:42 am

here ya go! get this and then then Cat back system and be stainless from header to toe!

http://www.autoanything.com/GenericPages/ProductImage.aspx?IsVariantMedia=1&GroupID=0&ImageID=62382&ProductID=4168

actually this is not the stainless one. that goes for about $1300 :shock:

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