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Old November 7th, 2011, 05:00 PM   #1
yyj87
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Default Exhaust options

My YJ needs all new tube run from the header back, it currently looks like the High School welding class used it for training.

I have decided that the 318 isnt for me, to build it to do what I want would cost too much. 4.5 it is! I just got a 4.0 block back from the machine shop, ill run a 4.2 crank/rods with a mild cam of some sort. This jeep will be a toy with in 3 months.

Option one: all 2.5"
Run it around the front of the oil pan like a TJ, just after it makes the last turn around the oil pan and points to the rear I would like to put a cherry bomb (red tube 26") . I would run it right out the back stock location tailpipe and all.

Option Two: all 2.5"
Run it around the front of the oil pan like a TJ and run a walker (cheep baffled) in the stock location.


I seem to rip through mufflers, Every time I go to Twisted trails I smash it.


Questions

Those who have run a bomb on a 4.0, state your opinion.

Am I going to have any issues with a cherrybomb/exhaust around the oil pan? Tjs do it so it should be fine but I'm a little paranoid.

Who in the traverse city area do you recommend to bend this up for me?
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Old November 7th, 2011, 05:02 PM   #2
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Anybody bending up custom tube will require a cat. I just had this done to my sons Jeep, front to back.
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Old November 7th, 2011, 05:06 PM   #3
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Anybody bending up custom tube will require a cat. I just had this done to my sons Jeep, front to back.

I realize I will probably end up putting it together myself (cut and but weld) but figured I would ask.
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Old November 7th, 2011, 05:13 PM   #4
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4.0's with cherry bombs will make you want to kill yourself. I put a quiet muffler back on. Couldn't take the audio abuse anymore.
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Old November 7th, 2011, 05:25 PM   #5
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i had a 93 yj with the 4.0 in it and loved the glass pack. i wanted it louder so i cut it off and ran straight pipe from the cat back. well cat housing back. gut your old cat if u want.....it makes it sounds amazing. it acts as a resinator.

though very loud...like stated above

but its shouldnt be a problem. i eventually ran mine out in front of the passenger rear tire with no cat and a harley davidson resinator. uber loud
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Old November 7th, 2011, 05:34 PM   #6
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It will come out the back with a downturn. I currently have a cherry-bomb turbo and though it sounds like shit its definitely not too loud.

35s and 4.11s will put me pretty low in the RPM range at 55, its been a years since this thing has seen freeway time.
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Old November 7th, 2011, 05:42 PM   #7
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i had a 93 yj with the 4.0 in it and loved the glass pack. i wanted it louder so i cut it off and ran straight pipe from the cat back. well cat housing back. gut your old cat if u want.....it makes it sounds amazing. it acts as a resinator.

though very loud...like stated above

but its shouldnt be a problem. i eventually ran mine out in front of the passenger rear tire with no cat and a harley davidson resinator. uber loud
How do we nominate this guy for a retard badge?
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Old November 7th, 2011, 05:57 PM   #8
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I can point to a guy on the north side of mancelona, he does great tube work (but his welds sucks balls). I had dual 2.5" put on my tahoe for I think 130$, stainless tube.
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Old November 7th, 2011, 06:10 PM   #9
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I can point to a guy on the north side of mancelona, he does great tube work (but his welds sucks balls). I had dual 2.5" put on my tahoe for I think 130$, stainless tube.
that is a scary cheep price.....
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Old November 7th, 2011, 06:36 PM   #10
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I have a glass pack on mine and I like it. I also run a catalytic converter because it gets fumey with just the rear window rolled up. The converter also took the drone out. I have 2.5" from an aftermarket header back. Ebay stainless header and converter.

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Old November 7th, 2011, 11:01 PM   #11
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How do we nominate this guy for a retard badge?
how so? because i like the sound of my 4.0 straight piped. i ended up running headers. i loved it. its all personal preference.
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Old November 7th, 2011, 11:52 PM   #12
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I ran my 4.0 with a cherry bomb and no cat for a while. It was loud and annoying above 2500 RPM. It also lost a lot of low end torque. The fumes were bad as well. I've been running a TJ downpipe, a $40 universal cat and a Flowmaster 40 with a turn down for about 2 years now. It sounds good and has held up well.
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Old November 8th, 2011, 12:08 AM   #13
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how so? because i like the sound of my 4.0 straight piped. i ended up running headers. i loved it. its all personal preference.
How do you run headers on an inline?
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Old November 8th, 2011, 02:06 PM   #14
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throught the hood with tractor flappers. duh?
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Old November 8th, 2011, 03:55 PM   #15
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The 360 in my yj is pretty quiet.

Coming of Manifolds to 2.5" pipe, Y's together and have a cat by the T-case.
From there 3" back to factory exit point with a Supertrapp Disc only kit on the end of it.

Sounds Throaty, but it's nice and quiet.
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Old November 8th, 2011, 03:56 PM   #16
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I cant smell a DAMN thing ever, I spoke with my dad and a friend and they both agreed its stinky in my jeep under 30 w/ the top off and all the time w/ top on.

So I'm going to run a TJ system w/ cat, weld the cherry bomb on right behind the cat and then continue on to rear bumper. If its all done in 2.5" it should sound pretty good.

I don't much care if its a little loud, it doesn't have to sound perfect either. my main concern is that I don't end up with a busted up exhaust system the first time out to TT.

I drove home from TT with nothing but a down pipe last summer and It sounded like SHIT. Straight piped in line 6 is bad news.

Big blocks are they only engines that sound great with straight pipes IMO, small blocks sound good.
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Old November 9th, 2011, 07:20 AM   #17
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How do you run headers on an inline?
my bad......header* lol
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