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Old 03-18-2018, 10:22 AM
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Adding resonator to aftermarket exhaust (question)

I bought a Pypes catback system solely for eliminating the muffler hanging off the rear end. Okay, 99% for clearance issues, and 1% if it gave a little better note, nice bonus.

Mission accomplished:
Removing the stock exhaust had a couple small challenges, but pretty easy even for a novice like me. The install was even easier... literally 20 minutes. Build quality and value on this Pypes system both exceeded my expectations.

For people wanting a little louder exhaust, this is perfect. But because I bought this for clearance and not for sound, it is a bit too loud for my taste. From another post, @Pressurized recommended a Vista resonator.
Great, should be perfect solution for me. Now having a grand total one day of experience on exhaust systems, I have a question.
I assume I will install the resonator there, just before the muffler. The muffler end has the slots, meaning it's inside diameter is 2.5" and will accept the 2.5" outside diameter resonator end. Am I good so far?

At the other end of the resonator, though, we have matching 2.5" outside diameter pipe ends. Do I just cut the length planning to mate them with a
sleeve clamp like this:
Am I on track here? Missing something?

Thank you!

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Old 03-18-2018, 10:26 AM   #2
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Should be fine. But those clams will eventually leak. Better to take it to a muffler shop and have them weld it together.


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Old 03-18-2018, 10:34 AM   #3
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Get it welded in...we did this with my brothers magnaflow cat back as well, had the stock resonator welded in front of the muffler.

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Old 03-18-2018, 01:42 PM   #4
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If you already have muffler then adding the small extra resonator will not make much difference to the sound/noise. If you really want to reduce sound then remove the supplied muffler and find the largest straight through muffler that will fit and put that in.
I've had good success with the magnaflows, looking for something that is straight through with a perforated tube inside that is the same diameter as the outside pipe (2.5" in your case). They do work, and if I use a single muffler on a street car it is only marginally louder than stock. The downside is that they are fibreglass packed and it will blow out over time. For sound reduction the most important thing is the overall volume of the muffler. Larger the better, but try larger diameter as well as longer. On the JK get whatever will fit in the space. Also, stainless only as the mild steel will die quickly.
Finally, if you do get it welded (I would) get a bolt on flange installed so that you can take the exhaust off if you need to. Try to get a stainless flange (most are not) and stainless bolts.
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Old 03-18-2018, 09:28 PM
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Aw, I was all excited to wrap this up myself. Now you guys are going to make me take it to a shop. Ha. But that's why I asked!
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Old 03-19-2018, 03:53 PM
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Well, that turned out way better than I expected.

Drove down to the closest muffler shop (which happens to have excellent online reviews, family shop) just to ask their advice. He was a little pessimistic that just adding back the stock resonator would have much effect (since the Pypes M80 is so small), but said it was worth a shot.

Even though they are packed and all three bays in use, says he'll do it on the spot for $80. Sold!

Best part is that it actually did make a noticeable change. Now it's perfect (for me). Just a bit louder than stock, but with lower tone.


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