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Exhaust options?

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Old Jan 28, 2020 | 11:40 AM
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Exhaust options?

I'm looking to re-design my exhaust from the muffler back to make room under the bed for an air tank. The current exhaust is a custom cat-back (California) with a Flowmaster 50 series single in/single out that splits in to two just over the pumpkin, and then exits at a 45 degree on both sides.

I'm looking to either cut it and do a dump about 12" past the muffler, or perhaps go "Lightning" style and have it exit the side of the truck, just before the passenger side wheel well. It would be a single 2 1/2" slash cut tip, not a double.

Anyone do something like this? If so, any major issues with fumes in the cab, heat on the tire, or in-cab drone?
 
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Old Jan 29, 2020 | 05:52 PM
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Hmmm... nuthin' but crickets eh? Oh well, I'll be cutting the pipe this weekend and "fabricating" something from the sections available at the local AutoZone. I'll post up pics if I'm successful.
 
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Old Jan 29, 2020 | 06:52 PM
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I have straight dumps after a flowmaster on mine. muffler was attached where the OE muffler was at. no exhaust issue but it does tend to drone a bit.
 
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Old Jan 30, 2020 | 09:32 PM
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For sure, expect drone, rumble, and likely corrosion under the bed.

Air tank? If I needed to carry an air tank, I'd carry my hand held before I'd rip my exhaust apart.
 
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Old Jan 30, 2020 | 10:08 PM
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Mine are also dumped, or turn downs. About the only thing that is going to save you room. Sounds great. I have always preferred dumped exhaust.
 
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Old Jan 31, 2020 | 12:10 AM
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I got a glasspack right after the y-connector, and dumped it. The reason for the long OEM tailpipe is to route exhaust gas away from the cab of the truck. An exhaust turndown may allow exhaust gas to collect under your truck, then rise into the passenger compartment. It could happen if you are sitting in traffic, and idling. Although it hasn't happened to me, and I've never had a passenger die from carbon monoxide poisoning. Noise? Drone? Well, the OEM system is engineered to be quiet. Anything else will be noisier. Some people like the exhaust note sound, and try to specifically tune the exhaust system for the sound which they think is good. Different people have said, "your truck sounds nice". But I had other reasons for getting rid of all that exhaust pipe. I doubt if there is any performance gain, or decrease in performance.
 
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Old Jan 31, 2020 | 11:10 AM
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Thanks to those that have chimed in

I've decided to stay away from doing a dump under the truck. I'll be experimenting with positions this weekend, but I'm 99% sure I'll be routing the exhaust out in front of the passenger rear wheel well.

As for the air tank, well, it's a mod I've wanted to do for quite some time even back when I had my CJ. After camping and wheeling with a couple of guys who had air tanks I think it's a must have mod on the trail, and the space under the bed is a perfect spot for one. I used to think it was great having the option for air tools on the trail, but nowadays it's easier to carry a cordless impact and a ratchet with large, multi amp-hour batteries. But the air tank is still invaluable to air up or even re-seat a tire bead that popped off the rim (which has happened to me). Next would be a portable or mounted welder. I have a portable welder that my father-in-law left me, but I've yet to learn to use it. Welding will be on my "to-learn" list this year.
 
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Old Jan 31, 2020 | 06:46 PM
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I've had dumps for about 12 of the years of ownership (bought it new in 2005) and I was actually more worried about heating up the diff but never had no real issues. I never would have figured about the rust/corrosion though.

Personally if I were to do it all again I'd think about doing low profile side discharge just before the tire on the passenger side. doing it on both sides would be a pain with the fuel tank on the driver side...

good luck with whatever you should choose!
 
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Old Jan 31, 2020 | 08:17 PM
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That'll look good. Pics when you can!
 
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Old Feb 1, 2020 | 01:48 AM
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Personally if I were to do it all again I'd think about doing low profile side discharge just before the tire on the passenger side. doing it on both sides would be a pain with the fuel tank on the driver side...
In my mind, the exhaust turndown is minimal. No extra pipes to worry about scraping on rocks, tree stumps, or uneven terrain.

I believe that there are several side exit exhaust kits on the market. No need to fabricate anything. Just buy, and bolt on.

I've seen people attempt to fabricate their own "true dual" exhaust options. I'm not too crazy about a hot exhaust pipe running alongside the fuel line and gas tank either.
 
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Old Feb 1, 2020 | 12:13 PM
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Originally Posted by Fifty150
In my mind, the exhaust turndown is minimal. No extra pipes to worry about scraping on rocks, tree stumps, or uneven terrain.

I believe that there are several side exit exhaust kits on the market. No need to fabricate anything. Just buy, and bolt on.

I've seen people attempt to fabricate their own "true dual" exhaust options. I'm not too crazy about a hot exhaust pipe running alongside the fuel line and gas tank either.
There wouldn't be much work to fabbing a side exit. I have a very good Flowmaster 50 series muffler in nearly the stock location, so a 45 degree bend, a 12" section of straight pipe capped with about a 9"-12" tip should do the trick. About $40 at Autozone vs. $300 - $400 doe a pre-fabbed kit with a muffler.

A true dual system on these trucks would require fabbing new pipe post cats and then running some type of narrow, bullet style muffler or a dual in/dual out muffler with dual pipes running down the passenger side. A dual In/out muffler would be good in that you could for go making an x-pipe.
 
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