Dual Exhaust?

[AL BUNDY]

Anyone ever convert to dual exhaust?

I like the sound and rumble of dual mufflers and having dual cat's might help emission's tests also.

 

[Mr_Random]

Anyone ever convert to dual exhaust?

I like the sound and rumble of dual mufflers and having dual cat's might help emission's tests also.

If you're actually running dual Y's at the header, THEN it would make sense, but it isn't gonna help anything to run duals from a single collector. Plus, it looks dumb in a cherokee, and heats the crap out of your fuel lines if you don't make some good shielding. Most of that rumble comes from an engine with more pistons anyways...

 

[Darky]

I forget what header has two pipes coming out, but one does and would allow for dual exhaust, but I don't see it being much of a benefit.

 

[GrimmJeeper]

I forget what header has two pipes coming out, but one does and would allow for dual exhaust, but I don't see it being much of a benefit.

i believe wrangler exhaust manifolds are a two piece design.

 

[wolfpackjeeper]

the pacesetter and the clifford split it as well.

Dual outs are a waste of time and overly complicated on a cherokee. Not worth the money.

 

[AL BUNDY]

It's just an idea. I know that it may not make a big difference in performance.

I had a 1979 Camaro Z28 that split into dual mufflers after the cat. On paper, you would look at it and think why bother? But driving the car, it sounded and felt just like true dual exhaust from a 1970 Camaro.
If I convert my jeep, I would want it to split before the cats, though.

 

[MPETESS10]

lots of extra weight, not to mention complication of tryin to fit all those items under the heep. there is more room on the right side of the gas tankl than there is on the left. not to say it cant be done because I have seen dual pipes coming out the back of an XJ before. but c'mon its a tractor motor for cripe's sake!!!! there is not much you can do to make it sound better. and running dual cats will probably make it fail emmissions as opposed to helping it pass.
aside from the fact that XJ's never had that setup OEM which will make some places fail it, you will not be getting as much heat in the converter which will make it not burn off the pollutants as easily if at all.

 

[Johnnie Walker]

You would benefit from a larger single pipe than duals. And besides duals on a stock or even mild built 4.0L isnt worth it.

 

[yossarian19]

Most of us can agree that it isn't much gain on anything but a king-hell stroker build... but it looks badass and it's something different.

I suppose you just put one o2 sensor on an X-pipe (if you have a Clifford or Pacesetter header), the other on one of the cats? or run a single 3" cat and put the O2 sensor on that, then a Y-pipe?
If one were so inclined, I mean...

 

[XJ_Otto]

I had duals on mine after the muffler, but I got rid of it for a stock exhaust. But the tail pipes were falling out of the back of the muffler too, so it was loud and annoying. Plus I personally thought it looked dumb, but the previous owner did it. It did cause a rear O2 CEL though, b/c after I installed the stock exhaust, the CEL went away.

 

[sittin_high]

if you want duals get a single in dual out flowmaster its rumbles very nice...if turned down b4 the axel

 

[wolfpackjeeper]

Yea, but the flowmaster kills any horsepower gains by being restrictive

 

[Johnnie Walker]

if you want duals get a single in dual out flowmaster its rumbles very nice...if turned down b4 the axel

And what is the point of not-true dual out if you just dump it?

 

[AL BUNDY]

I have seen a single inlet, dual outlet cat. That would be the simplest way to split it.

 

[bjoehandley]

Yea, but the flowmaster kills any horsepower gains by being restrictive

If you go oversized (larger 2.5" in and out), wouldn't that problem be negated then?

 

[wolfpackjeeper]

no, because the flowmaster slows down velocity by its design. All the baffles force the air into crazy flow patterns and create a bunch of turbulence.

You could still use a single in/dual out muffler, I would just use something other than flowmaster. Something like a Dynomax super turbo or a Magnaflow.

 

[Talyn]

00+ has the two outs manifolds. The factory manifolds won't work on earlier heads (non 0331) due to the exhaust and shape size difference. However I have heard that aftermarket headers for 00+ will work on earlier heads. But then if you don't have two O2 sensors like some of the 00+ do then which bank would you put the O2 sensor? In the crossover pipe as some one suggested? Not only will the routing be a problem, but you then will have the extra eight of two exhaust piper, tow mufflers, and two cats.

 

[sittin_high]

If you go oversized (larger 2.5" in and out), wouldn't that problem be negated then?

my super 44 is 3" in and daul 2.5" out