Upgrading exhaust - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 10 Old 04-17-2016, 02:51 AM Thread Starter
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Upgrading exhaust

I'm looking into upgrading my exhaust system on my 2 door sport. I see there is some that eliminate the rear muffler which is what I would like to do but I'm not sure if it will the pass smog check when the time comes. California is tight with thir emission laws so I'm asking if I have to keep both mufflers or have just one and still be able to pass smog?
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post #2 of 10 Old 04-17-2016, 05:31 PM
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if they have the carb stamp you should be ok
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post #3 of 10 Old 04-17-2016, 06:44 PM
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I went with a Dynomax dual and I love it!! Great sound and look.

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post #4 of 10 Old 04-17-2016, 09:00 PM
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Anything after the catalyst and rear(downstream) O2 sensor is ok. Funny thing im looking for one too but I don't want anything loud its a v-6 and to me most sound like garbage IMO. I just want to get rid of the massive rear muffler.so it looks like I will be fabricating my own exh system.

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post #5 of 10 Old 04-21-2016, 01:46 PM
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If you guys are in the LA area, there is a spot that will hook it up for a good price. I had mine done for about $150 or $175 muffler included. It was much cheaper than any other shop in my area. I basically told them where I wanted the muffler and exactly how I wanted the pipes ran and he did it. Couldn't be happier. I mounted mine by the frame in front of the rear tire and had the exhaust pipe run over my sway bar and out. I just passed smog with no issues and the sound isn't too bad. Sound isn't bad at all. Let me know if you want pictures.

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This isn't mine but I ran mine very similar to this.

Last edited by WeGo4x4; 04-21-2016 at 01:50 PM.
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post #6 of 10 Old 05-18-2016, 10:03 AM
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I finally tested our (dominion offroad) muffler relo kit on my own JK. It's very quiet. Not as quiet as the factory muff, but definitely that direction. I'm going to be doing another production run soon. If you're in socal and would like to listen, hit me up. Our warehouse is in Santa Ana.

Quote:
Originally Posted by Mark915 View Post
Anything after the catalyst and rear(downstream) O2 sensor is ok. Funny thing im looking for one too but I don't want anything loud its a v-6 and to me most sound like garbage IMO. I just want to get rid of the massive rear muffler.so it looks like I will be fabricating my own exh system.

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post #7 of 10 Old 05-19-2016, 04:55 AM
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Did a magnaflow upgrade and removed the catalytic converter still passes the smog test.
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post #8 of 10 Old 05-20-2016, 11:17 AM
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Quote:
Originally Posted by lowender View Post
Did a magnaflow upgrade and removed the catalytic converter still passes the smog test.
This definitely wont work in CA. You can't even replace your cat with just any cat in CA. There are cats you can buy for 49 states, and there are CA CARB compliant ones. They're stamped with a serial number, so even if you pass emissions tests, the smog shop will need to verify that your cat has that stamp. It's a headache.

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post #9 of 10 Old 05-20-2016, 12:15 PM
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I may be too old-school or not aware of modern limitations but couldn't some form of muffler dump be inconspicuously installed upon California vehicles so that they'll be compliant during the annual check for emissions compliance but when ya wanted to, have the noxious exhaust bypass that weeny,treehugging system and just dump out earlier in the route?
It would irritate me so much to have that stringent of emissions laws that I'd have to find some means of sneakily leaving the giant carbon footprint all over California just because....


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post #10 of 10 Old 10-01-2016, 10:56 PM
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Quote:
Originally Posted by WeGo4x4 View Post
If you guys are in the LA area, there is a spot that will hook it up for a good price. I had mine done for about $150 or $175 muffler included.
Wish I knew this sooner before dropping ~$165 for a Flowmaster HP2. Thing drones loudest right in the 2k-2.5k range

I was also trying to minimize dB while deleting the stock muffler, but I've never welded anything and didn't want to spend time practicing first so...



FYI, don't JB Weld exhaust components. They're supposed to be rated for high temp, but it has a different thermal expansion coefficient than the pipe steel so now there's a gap all the way around where I patched my garbage weld job above. And worse, it has a terrible chemical smell every time it heats up so I smell it whenever I get out of my Jeep. Hoping it goes away in the next week or two but it can't be good to breathe. Otherwise, I'll have to trim off the napkin ring JB Weld.
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