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Old 10-24-2011, 02:05 PM   #1
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Flowmaster Force II

I know exhaust has been discussed endlessly, and I also know its not going to do anything great for performance, or make it sound like a deep V8...etc.

but with that all being said, have any of you installed the Flowmaster Force II muffler on a 07-11 JKU? I could not find any posts on the subject.

Flowmaster Exhaust 817437 - Flowmaster® Force II Stainless Steel Catback Kit for 07-11 Jeep® Wrangler & Wrangler Unlimited JK - Quadratec

I am more interested in the smaller size and look as compared to the stock muffler. I also don't want anything much louder than stock. I hear good things about Flowmaster, and this kit looks easy to do, I just don't know if there are any negatives, now, or down the road (other than a ticket price of almost $400!).

I don't see a cat-back being worth the time or money. But a simple muffler upgrade may be what works best for me, plus I can do the installation myself.

Thanks for the help!

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Old 10-24-2011, 02:51 PM   #2
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Well that looks like about $125 from a local muffler shop. If you don't want it to be louder than stock, why replace the muffler at all? so its a little smaller, big deal. I love my FM40 and yes, it is very deep sounding.

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Old 10-24-2011, 03:56 PM   #3
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That is way too expensive. Didn't do that one exactly, like El Gringo, I had my local muffler shop put on a new Flowmaster 40 with what looked like the exact pipes on the one pictured above and it cost me $168 parts and labor out the door.
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Old 10-24-2011, 04:15 PM   #4
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NOPE, had to get rid of that "HUGE" stocker, so I put in a Flowmaster 40 cat-back and installed it right in front of the Evap can-


Quote:
Originally Posted by El Gringo View Post
Well that looks like about $125 from a local muffler shop. If you don't want it to be louder than stock, why replace the muffler at all? so its a little smaller, big deal. I love my FM40 and yes, it is very deep sounding.
Like El Gringos--the sound is GREAT, but if you want a stock sound--this ain't for you--



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Old 10-24-2011, 04:27 PM   #5
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Old 10-24-2011, 04:38 PM   #6
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Looks good its the same one im looking at. It is cheeper on amazon.
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Old 10-24-2011, 04:44 PM   #7
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Save yourself a lot of cash and go to Meineke, and ask for their chambered muffler. They look and sound exactly like Flowmaster 40's, for a hell of a lot less bread.
Or not, it's your money/Jeep.
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Old 10-24-2011, 05:16 PM   #8
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thanks for the info all. What i'm most interested in is a smaller profile, bolt on "axel back" replacement...like Jimbo said, get rid of that HUGE stocker (which is now getting all rusty & cruddy).

If I want to do that, with a bolt on muffler, that is not loud like a FM40, what do you all suggest?
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Old 10-24-2011, 05:23 PM   #9
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If you're gonna installit back there where the stocker was--


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Originally Posted by TanManRubi View Post
thanks for the info all. What i'm most interested in is a smaller profile, bolt on "axel back" replacement...like Jimbo said, get rid of that HUGE stocker (which is now getting all rusty & cruddy).

If I want to do that, with a bolt on muffler, that is not loud like a FM40, what do you all suggest?
The Flowmaster 50 will fit and is pretty mellow !

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Old 10-24-2011, 05:25 PM   #10
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I just had a FM on mine in the stock location. It did not sound good to me and had a terrible drone. I added a resonator in the pipe and that helped with the sound but not the drone. The muffler shop swapped out the FM for a stainless Magnaflow in the stock location. It is exactly what I wanted and I suspect it is what you are looking for. It is not loud but has a nice sound to it. It seems to flow a little better as well.
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Old 10-24-2011, 06:13 PM   #11
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Quote:
Originally Posted by tjt94
I just had a FM on mine in the stock location. It did not sound good to me and had a terrible drone. I added a resonator in the pipe and that helped with the sound but not the drone. The muffler shop swapped out the FM for a stainless Magnaflow in the stock location. It is exactly what I wanted and I suspect it is what you are looking for. It is not loud but has a nice sound to it. It seems to flow a little better as well.
I forget what it is but JimmyEC on here has one that is pretty low profile and is pretty mellow, but def there. I am fairly certain that it is a magnaflow.
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Old 11-09-2011, 08:55 AM   #12
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Originally Posted by rics1997 View Post
That is way too expensive. Didn't do that one exactly, like El Gringo, I had my local muffler shop put on a new Flowmaster 40 with what looked like the exact pipes on the one pictured above and it cost me $168 parts and labor out the door.
Did you purchase the muffler or did they have order?

Where did they mount it?

Any drone?
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Old 11-09-2011, 09:08 AM   #13
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I just walked into the muffler shop and asked a couple questions and 20min later had it on and driving out the parking lot. The $168 was for the muffler they had in stock, new pipes custom bent, and the dreaded Tn sales tax.

They mounted it in the stock location though it took up half the room. Being a 2 door, there isn't much choice on relocation as with the 4 dr Unlimited's.

Yes, there was some drone but mainly it was too loud for me. I was actually planning on removing it in a few months. But after about 3 to 4 weeks, it quieted down and the drone is no longer noticeable. I am actually happy with it now that it is broke in and plan to keep it now. It has a much better deep noise now.
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Old 11-09-2011, 09:51 AM   #14
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I second that. The sound will change. Which makes no sense because it is a chambered muffler, so there is nothing to wear down.
If if you want less drone and interior noise, make sure the tailpipe is either even with the bumper or even sticks a little further out. I had a tip on mine that rusted out and I removed it and now the exit is about 3-4" inside the back of the bumper and it is considerably louder inside. I actually like it like that. After a couple of months its like having a new muffler. FOR FREE. Lol, but seriously the tone will change a little and it does mellow out a little and gets louder and deeper after the engine has been running for a couple hours. Everyone at the off-road park last weekend thought I had a hemi swap. Until I got stuck in the mud and was spinning the engine at ~5k Rpm and it was clear it had a V6. But sounds really deep to about 3k or so. Just pull the trigger on it. That paired with some e3 plugs and a ram air intake gets this thing jamming. All of the bad reviews on intake/exhaust saying it doesn't do anything are all from people who don't have them. I SMOKED my moms stock jk on Sunday night in a "street race". And mine is lifted, has heavy tires and bumpers and the like. So that's all the proof I need.
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Old 11-09-2011, 09:59 AM   #15
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Quote:
Originally Posted by El Gringo View Post
I SMOKED my moms stock jk on Sunday night in a "street race". And mine is lifted, has heavy tires and bumpers and the like. So that's all the proof I need.
did you really race you Mom?

I ended up going with the Flowmaster 50 muffler, it fits well, I think it sounds great (not very loud) and I am very happy with it.
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Old 11-09-2011, 10:06 AM   #16
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Quote:
Originally Posted by JIMBOX
NOPE, had to get rid of that "HUGE" stocker, so I put in a Flowmaster 40 cat-back and installed it right in front of the Evap can-

Like El Gringos--the sound is GREAT, but if you want a stock sound--this ain't for you--

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Question, "installed in front of evap can"

Reason for this? Can or does the flo 40 install in one set position. Was this a change for that reason (if one)

Do my ?'s make sense? Lol
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Old 11-09-2011, 10:08 AM   #17
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I was at a local muffler shop just yesterday asking about the FM's. They told me that the 40 would be miserable from the inside and not to go that way. He advised the 50 saying that in such a small vehicle there would be a lot of drone/noise inside. I'd like a better flow for sure and a sweeter sound but not something that would drive me nuts while driving.

So, what's the consensus on all this...Don't wanna waste money...
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Old 11-09-2011, 10:09 AM   #18
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So many things I want, I think I will wait till after I buy 5 new tires and wheels, lift, and bumper to think about exhaust lol.
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Old 11-09-2011, 10:12 AM   #19
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So many things I want, I think I will wait till after I buy 5 new tires and wheels, lift, and bumper to think about exhaust lol.
Can't disagree with that either...
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Old 11-09-2011, 10:23 AM   #20
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Originally Posted by Mr. Sinister View Post
Save yourself a lot of cash and go to Meineke, and ask for their chambered muffler. They look and sound exactly like Flowmaster 40's, for a hell of a lot less bread.
Or not, it's your money/Jeep.

Tell me more info, I'm ready to do this tonight... Did they install it in the stock location or where? Any drone? If I ask them for their chambered muffler and I want it installed, will they know what I'm talking about with your info or will I have to give them dimensions, any more details or pics?

Will this setup give me a torque bump like the mbrp or magnaflow system or am I going to loose torque/ hp and just get more noise?

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Old 11-09-2011, 10:42 AM   #21
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Quote:
Originally Posted by 10to10

Tell me more info, I'm ready to do this tonight... Did they install it in the stock location or where? Any drone? If I ask them for their chambered muffler and I want it installed, will they know what I'm talking about with your info or will I have to give them dimensions, any more details or pics?

Will this setup give me a torque bump like the mbrp or magnaflow system or am I going to loose torque/ hp and just get more noise?

Good questions.
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Old 11-09-2011, 12:36 PM   #22
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You need a 2.5" inlet, offset; 2.5" outlet center. They need to bend a pipe 90 deg for the inlet and attach where the stock muffler unbolts. They can cut off and reuse the stock tailpipe if desired.
They will need to remove the bolt that holds the muffler band in and more or less cut the supports for the muffler. Then bend the pipe and weld it all on. Just tell them you want it centered up under the rear and they will make it work. That is their job, they know how to do it, to an extent. Oh and the inlet that is offset needs to be towards the rear, makes it flow easier.
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Old 11-09-2011, 05:39 PM   #23
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Originally Posted by Dogface View Post
I was at a local muffler shop just yesterday asking about the FM's. They told me that the 40 would be miserable from the inside and not to go that way. He advised the 50 saying that in such a small vehicle there would be a lot of drone/noise inside. I'd like a better flow for sure and a sweeter sound but not something that would drive me nuts while driving.

So, what's the consensus on all this...Don't wanna waste money...
I just had a Flowmaster 50 on mine in the stock location. It did not sound good to me and had a terrible drone. I then added a resonator in the pipe and that helped with the sound but not the drone. The muffler shop swapped out the Flowmaster for a stainless steel Magnaflow in the stock location. It is exactly what I wanted and I suspect it is what you are looking for. It is not loud but has a nice sound to it. It seems to flow a little better as well.

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