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06 KJ 3.7L Exhaust Question
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Author:  Xdanielb [ Mon Aug 21, 2017 4:24 am ]
Post subject:  06 KJ 3.7L Exhaust Question

Hello everyone, i'm new to the forum and I have a 2006 Jeep KJ 3.7L sport and the question of what muffler to get has been tossed around a lot but for my vehicle I was wondering what would be the "best" way of modifying the exhaust so I can hear that V6, original thought was to go for a muffler delete but I hear the whole controversy of "you'll lose back-pressure so you'll lose torque" so I was considering on just changing my muffler to a Flowmaster Super 44 or also a resonator delete, whats the loudest, etc. Thank you in advance

Author:  GordnadoCRD [ Mon Aug 21, 2017 11:14 am ]
Post subject:  Re: 06 KJ 3.7L Exhaust Question

Gibson MWA

Quiet at idle, but is essentially a straight pipe at full throttle. You don't want back-pressure then.

Author:  Laserfishy [ Wed Aug 23, 2017 3:51 pm ]
Post subject:  Re: 06 KJ 3.7L Exhaust Question

Muffler delete will be super loud, you can test it by unbolting the muffler and removing the back half of the exhaust. It's a little hard to manuever out from underneath, but not too hard of a job. I run a cheap glass pack, it's not too loud at idle and still lets you hear the engine rev

Sent from my SM-G930V using Tapatalk

Author:  Xdanielb [ Wed Aug 23, 2017 8:52 pm ]
Post subject:  Re: 06 KJ 3.7L Exhaust Question

GordnadoCRD wrote:
Gibson MWA

Quiet at idle, but is essentially a straight pipe at full throttle. You don't want back-pressure then.


Wow did my research on gibson they seem really good but i kind of want a decent sounding idle too.

Laserfishy wrote:
Muffler delete will be super loud, you can test it by unbolting the muffler and removing the back half of the exhaust. It's a little hard to manuever out from underneath, but not too hard of a job. I run a cheap glass pack, it's not too loud at idle and still lets you hear the engine rev

Sent from my SM-G930V using Tapatalk


I'm going to unbolt the muffler and see how it is if i'm not a fan I'll probably just commit to the flowmaster

Author:  tommudd [ Sat Aug 26, 2017 9:36 am ]
Post subject:  Re: 06 KJ 3.7L Exhaust Question

Xdanielb wrote:
GordnadoCRD wrote:
Gibson MWA

Quiet at idle, but is essentially a straight pipe at full throttle. You don't want back-pressure then.


Wow did my research on gibson they seem really good but i kind of want a decent sounding idle too.

Laserfishy wrote:
Muffler delete will be super loud, you can test it by unbolting the muffler and removing the back half of the exhaust. It's a little hard to manuever out from underneath, but not too hard of a job. I run a cheap glass pack, it's not too loud at idle and still lets you hear the engine rev

Sent from my SM-G930V using Tapatalk


I'm going to unbolt the muffler and see how it is if i'm not a fan I'll probably just commit to the flowmaster


So you don't like to talk to others in the cabin going down the road ?
Look up Flowmaster Drone , ran one for a while on the KJ never again

Author:  lfhoward [ Sat Aug 26, 2017 12:02 pm ]
Post subject:  Re: 06 KJ 3.7L Exhaust Question

tommudd wrote:
So you don't like to talk to others in the cabin going down the road ?
Look up Flowmaster Drone , ran one for a while on the KJ never again

Tom, I remember riding with you in your black Kilimanjaro KJ (going to town to pick up a cutting wheel and some bolts for my KK's rear sway bar IIRC). Your exhaust note sounded great at the time. Was that a Gibson?

Author:  tommudd [ Sat Aug 26, 2017 7:25 pm ]
Post subject:  Re: 06 KJ 3.7L Exhaust Question

lfhoward wrote:
tommudd wrote:
So you don't like to talk to others in the cabin going down the road ?
Look up Flowmaster Drone , ran one for a while on the KJ never again

Tom, I remember riding with you in your black Kilimanjaro KJ (going to town to pick up a cutting wheel and some bolts for my KK's rear sway bar IIRC). Your exhaust note sounded great at the time. Was that a Gibson?


Magnaflow
and its still on there ! LOL

Author:  rhyanb12 [ Mon Sep 25, 2017 3:24 am ]
Post subject:  Re: 06 KJ 3.7L Exhaust Question

Not a fan of Flowmaster. It is annoyingly loud.

Author:  angelis_digital [ Sat Oct 21, 2017 5:06 pm ]
Post subject:  Re: 06 KJ 3.7L Exhaust Question

I just put on a Flowmaster Super 44 to my '04. It's fun but I'm going to get a replacement down the road. It has a drone that's easy enough to avoid but still bugs me. I was thinking MBRP?

Author:  GordnadoCRD [ Sat Oct 21, 2017 9:06 pm ]
Post subject:  Re: 06 KJ 3.7L Exhaust Question

rhyanb12 wrote:
Not a fan of Flowmaster. It is annoyingly loud.

Depends on what model you buy.
My brother in law has a 1992 Toyota pickup with 4 cylinder and STOCK exhaust, and it's louder than the Jeep CRD, Either inside or out. But the Jeep with the 50 delta force has a deeper tone.
If you get a stainless steel one (whatever brand) if the drone is too loud you can wrap it with header wrap to make it quieter still, without worrying a about it corroding through.

Author:  mercdude [ Fri May 24, 2019 6:22 pm ]
Post subject:  Re: 06 KJ 3.7L Exhaust Question

Replaced my kJ muffler with the longest 2 1/2” center in/out dynomax superturbo muffler I could get - I think 28” casing. When cold, it has increased interior sound, when warm it’s as quiet as stock. Most likely the lengthening of the pipe when warm alters the nvh omitted by the exhaust. Picked up a bit of power from it at upper rpm and 1-2mpg. But, not a dramatic change ... still, I consider it a cost effective mod.

Unlike many other oem big mufflers, the kjs stock muffler is basically straight through albeit super long with a large open central chamber that houses fiberglass packing. Which makes it hard to beat for sound dampening and performance, so don’t expect a major performance upgrade.

Author:  u2slow [ Wed Jun 12, 2019 4:02 pm ]
Post subject:  Re: 06 KJ 3.7L Exhaust Question

I installed a welded Thrush several years ago. Its basically a 2-chamber flowmaster copy. Sound depends a lot on when you shift, and what you're used to. The 2500-3500 pull sounds amazing. Whatever, makes her happy. Still not as loud as the cummins truck. :goink:

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