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Discussion Starter #1
I'm installing the 1 3/4" JBA LT, JBA catless midpipe, JBA catback exhaust this weekend. Nervous how loud it might be so I purchased the ultra quiet to install post-muffler. Curious if anyone is running 2 of these, 1 post-muffler and 1 pre-muffler. I would have just purchased Cajun's resonated b-pipes but they don't work with the 1 3/4" headers. Whatcha think??
 

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I have the Cajun b-pipes with JBA from there to the back and it was too loud for me without the resonator. Tried it without the resonator first but after a week it was just too loud. TIG welded the resonator pre-muffler. Good luck bro.
 

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Discussion Starter #3
Yeah I definitely know I'll need at least 1! I'm in the middle of the project, just got everything removed except for the headers. Got the heat shields of tonight and soaking the nuts with PB Blaster. Can't wait to get it done, then I'll get Uprev from Joe
 

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PRE muffler?
 

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I have the same exhaust setup as what you are installing with a UQ post muffler. Too damn loud. Been thinking about having a second UQ installed pre-muffler.
 

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You can install a resonator pre muffler if you like. Its just going to keep the resonation at a lower decibel, Which in your case is not a bad thing. We have ran over a dozen configurations and we have come up with a great solution.
We run the JBA 1 7/8 LongTubes with full Cajun 3" Bpipes and Y pipe. This is hooked to a Performance Curve stainless muffler Part# XS2579 3" then into a UQ resonator in the tailpipe. This setup is quiet around town but has some muscle when WOT. You can run the typical 2.25 or 2.5" Cajun setups with this same muffler configuration. Will be even quieter. Hope this helps.
www.teamvenom.racing
 

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Discussion Starter #8
I just welded on the UQ resonator post muffler. It did take a lot of the drone away but I'm thinking about welding another one on pre-muffler. Thanks for the info Venom!
 

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That muffler that Venom suggested won't help. It's a straight-through design just like the muffler we have, this guy is drag racing a Titan, what he thinks is loud is quite different than what others would think.
Many people with our exhaust setups think that they aren't too loud. At one time, I tried to figure out if I could fit LandCruiser 5.7 mufflers under my truck. For now, I'm probably just going to try a 2nd UQ.
 

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Discussion Starter #10
Do you notice more than usual amount of exhaust fumes now that you have this exhaust system? I haven't purchased Uprev yet...
 

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Do you notice more than usual amount of exhaust fumes now that you have this exhaust system? I haven't purchased Uprev yet...
No, I was tuned right away, though.
I did have a PITA issue with a P2A00 code that was caused by poor quality JBA manifold ports not lining up with the gasket on the driver side. After several attempts to re-align the manifold ports by loosening the manifold and pushing it into various offsets, I finally fixed the P2A00 issue. It would sometimes run rich during warm-up.

Also, the P2A00 code wouldn't show up right away.
Around post 14 I put up pics of the gasket/port alignment issue I was experiencing.

Anyways, now all is good, and truck runs and smells normal.
 

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I had a second UQR installed today, in front of the JBA muffler:
542877


Here's the 1st UQR right before exhaust tip:
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So, I would say that the noise is reduced by a noticeable amount, equal to how much the noise was reduced when I had the 1st UQR installed. Goes like this:
-JBA Muffler, JBA headers and Cajun Catted B-Pipes: way too loud IMO. I know some people will like how loud it is this way, but it was over the top loud for me. Also, a fair amount of drone, tons of "rasp" when starting or driving somewhat aggressively, I was not liking the rasp at all.

-Added 1st UQR: Knocked the overall volume down by at least 3dB to my techie ears (see explanation about how I perceive it as -3dB), cut the rasp down significantly (still have some at start up), reduced the drone by a good deal. Was still loud overall, but seemed like the "edges" were softened up a bit.

-Added 2nd UQR: Again, an additional 3dB of perceived volume reduction. I didn't hear ANY rasp at all after installing the 2nd UQR, and there is NO drone at all, however when I tow we will see how that goes. Towing brings out the drone demons in most setups that aren't OEM.

Explanation of 3dB: 3dB is simply what it takes for a human to perceive a noticeable reduction in volume. 6dB is what it takes for a human to perceive a reduction of volume by half. It is not a linear measurement. You can not just add the 1st 3dB I had to the 2nd 3dB and get 6dB and think the exhaust is half as quiet. It is more like 4.5dB, definitely quieter, but not half as much yet.

I would say that my truck is now at a reasonable volume level. It is still MUCH louder than any OEM vehicle! My other car, a Q60 (G37 coupe basically) has what would be called a "loud" OEM exhaust. It is MUCH quieter than my Titan even after adding 2 UQR's. But, the exhaust noise in my truck now seems more "distant" and "soft edged" and I am happy enough with it to conclude my quest for a quieter exhaust.

It's noisy enough to bother people driving Prius, so that consoles me!
 

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Discussion Starter #13
Right on that's good to hear (pun intended). I actually just got home from the weld shop, I had them weld 2 Magnaflow hi-flow cats where the cats should be. It brought the noise down and seemed to make the exhaust note deeper. The exhaust doesn't smoke as much also which was something I was looking for. Your right about the towing...I'll be towing my trailer in a couple days so we'll see if its quieter. My Uprev cable is supposed to come today! So as of now I have the 1 3/4 JBA LT, Catted B-pipes, JBA CBE, UQ post muffler.
 

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Cool, let us know how the towing goes.

I just wrapped up my tuning yesterday, seems my truck is all done now!
 

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I would say it's somewhere in between the two. Your neighbors aren't going to hate you, but its definitely louder than stock. A muffler delete + UQ res is basically what I have in this video. From the outside, cold starts are decently loud. Definitely not straight pipe but there is a noticeable percussion. Once its warm though, I would say it's the perfect volume. Just enough that you can hear it clearly with the windows down, but not so much that every pedestrian you pass is breaking their neck trying to see who the hoodlum running around ruining everyone's peace is. Inside the cabin if you unplug the symposer its about as loud as stock with the exception that at around 3k rpm under load, the cabin resonates at the same frequency as the exhaust and it causes a very pronounced "boomy-ness". Not enough to give you a headache, but enough that on a road trip you would avoid going up hills at 75-80 mph.
snaptube vidmate
 
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