Quiet exhaust for RIPPed 3.6 - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 9 Old 05-03-2018, 03:03 PM Thread Starter
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Quiet exhaust for RIPPed 3.6

So, I'm fishing for ideas. I've got a RIPPed 3.6 with some aftermarket exhaust (cannot remember what I bought). I bought it to free up space for a larger rear cubby, or maybe relocating the dual batts to the rear in the space under the cargo floor.

Anyway, I hate the way it sounds. It's LOUD under boost. Basically, I don't want to hear it at all.

The RIPP performed OK with the stock exhaust and it sounded OK (more of a woosh at full boost than anything), but I need the relocated design.

I'm looking to swap it out for something else. It seems like all of the aftermarket stuff is geared towards adding power and noise.

Has anyone with a forced induction Jeep done something similar? Ethier via a bolt on cat-back kit or by having the muffler can swapped out for something quieter? Recommendations? Besides turning up the radio?

Edit: I have the AFE cat-back....

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Last edited by Guruman; 05-04-2018 at 02:49 PM.
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post #2 of 9 Old 05-05-2018, 09:25 AM
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Quote:
Originally Posted by Guruman View Post
So, I'm fishing for ideas. I've got a RIPPed 3.6 with some aftermarket exhaust (cannot remember what I bought). I bought it to free up space for a larger rear cubby, or maybe relocating the dual batts to the rear in the space under the cargo floor.

Anyway, I hate the way it sounds. It's LOUD under boost. Basically, I don't want to hear it at all.

The RIPP performed OK with the stock exhaust and it sounded OK (more of a woosh at full boost than anything), but I need the relocated design.

I'm looking to swap it out for something else. It seems like all of the aftermarket stuff is geared towards adding power and noise.

Has anyone with a forced induction Jeep done something similar? Ethier via a bolt on cat-back kit or by having the muffler can swapped out for something quieter? Recommendations? Besides turning up the radio?

Edit: I have the AFE cat-back....
The front section is already 2.5" stainless tube and a straight through design. If you want the quietest solution, I would use the stock front section with an axle back muffler. Leave the pre-silencer in the stock front section - it is straight through. IMHO, the stock muffler is the only real restriction.


Perhaps put a Flowmaster 50 or 60 behind that. Here's their chart:

https://www.flowmastermufflers.com/street-mufflers/

Personally, I prefer mufflers that aren't just large glass packs but rather have some kind of internal baffling or noise canceling like Flowmaster.

I have the Flowmaster Super HP2 and while it is a little throaty and on the aggressive side, what is interesting is that the when you lug the engine, it does not get loud like a pharting Honda. At low engine speeds it is pretty tame. Noise seems to come with higher engine speed more so.

I think Corsa mufflers are another example of a baffled/noise canceling design that is also high flow.

IIRC, either Dynomax or Magnaflow also use a baffled design versus a wool packed core in a can.
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post #3 of 9 Old 05-05-2018, 10:06 AM
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^^^^^^^^^^I Agree ^^^^^^^

I tried different mfg's and the one that I could live with was the Flowmaster the loudness and drone of the others made it hard to spend any time comfortably in the jeep , after a couple of hours just had to get out and clear me head .
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post #4 of 9 Old 05-05-2018, 03:49 PM
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Dynomax Quiet Crawler

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post #5 of 9 Old 05-05-2018, 10:10 PM
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Not boosted here, but here's my (2010 2DR 3.8L 6MT) pre-axle exhaust experience.


The stock pipe (top) is good stuff - perfect to cut a muffler into. But, when I had to ditch the stock muffler, I threw in an MBRP “offroad” exhaust and cut the tailpipe cut off before the track bar (to fit my stretch). That was OK-ish, but droned at cruise RPM. I put a Supertrapp diffuser on the end and it was tolerable if I choked it down.

Switched to a 50-Series Flowmaster and MIGed it to the MBRP piping that was already modified for my oddball setup. GOOD muffler, no gnarly drone, far less ricey than the MBRP was, hard to crush, decent sound. If I had room to fit a 70 series, I would've done that. Case volume goes a long way toward killing noise w/o adding restriction. I think there's room for a 70 on a 4 DR if the evap's relocated .

Here's my Flowmaster 50 installed with FM's heat shield kit (good shit ) :

I'm done screwing with it (which is rare for me ) so I call it a win.

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post #6 of 9 Old 05-06-2018, 11:45 AM
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@ExWrench I'll need to drop by one of these days and hear that Flowmaster 50. Don't remember what your rig sounds like. We need to get back out on the trail anyway.
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post #7 of 9 Old 05-08-2018, 12:17 PM
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@ExWrench thanks for the write up. I too have the same FM 50, but it is outback in stock location. I dislike the rear look of the Jeep with it back there. I always thought about moving it under the drive seat and chopping the tail pipe post-axle.

As for the sound of the FM 50, it is awesome. I wish I had less drone sometimes, but with the top off it is not too bad. The 50 is much better then the 40 I had on there before. High revs (3k) and low gear you would put out a lot of noise.

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post #8 of 9 Old 05-08-2018, 01:03 PM
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Quote:
Originally Posted by Treader View Post
@ExWrench As for the sound of the FM 50, it is awesome. I wish I had less drone sometimes, but with the top off it is not too bad. The 50 is much better then the 40 I had on there before. High revs (3k) and low gear you would put out a lot of noise.
Do you run the stock pre-silencer in front of the FM50? If not, it would probably help knock out the drone.

If you do have it and it's not quiet enough, perhaps get a longer pre-silencer in there ahead of the FM50.


Something like this 18" stainless resonator:
https://www.amazon.com/Vibrant-17930.../dp/B0038HRNZ2


That or a Flowmaster HP2 2.5" ahead of the axle and leaving the 50 in place.
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post #9 of 9 Old 05-08-2018, 10:22 PM
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Quote:
Originally Posted by White13JKUR View Post
@ExWrench I'll need to drop by one of these days and hear that Flowmaster 50. Don't remember what your rig sounds like. We need to get back out on the trail anyway.
I'll be in the garage the next few weekends re-fawking the Jeep for 37s, so call me if you're in the area.

Quote:
Originally Posted by Treader View Post
@ExWrench thanks for the write up. I too have the same FM 50, but it is outback in stock location. I dislike the rear look of the Jeep with it back there. I always thought about moving it under the drive seat and chopping the tail pipe post-axle.

As for the sound of the FM 50, it is awesome. I wish I had less drone sometimes, but with the top off it is not too bad. The 50 is much better then the 40 I had on there before. High revs (3k) and low gear you would put out a lot of noise.
You're very welcome! If drone is a problem, you may want to snake a full tailpipe out the back after you move your muffler.
Dumping under the tub can contribute to exhaust noise woes, but my oddball setup didn't leave room for a tailpipe.
When I had the MBRP with the tailpipe cut off without the Supertrapp, that fookin' thing resonated the whole tub
To be fair, my exhaust exit location contributed to the pissed-offness that made me find a better solution

I feel the need to repeat this:
If I had a 4 door, I'd put a 70-series Flowmaster before the rear axle and make it a "sleeper" (case volume FTMFW ).

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