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Old 06-23-2010, 07:52 AM   #1
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Offset/Center or Center/Center Muffler?

This question goes out to all those folks that have installed mufflers under the cab of their JKU's. I'm not talking about the catback systems - just the muffler using stock pipes.

I'll be ordering the muffler from an online dealer and have my eye on a Borla ProXS muffler that is 9.5" wide x 14" long and comes in either Offset/Center or Center/Center in/out configurations.


I believe this is the same width as the Flowmaster 40 series that a lot of you use so I expect it to fit the same way. Of course I plan to have this mounted under the cab but which configuration fits best. And yes, I've already measured, but it looks like either one "might" fit. But why guess when I can call upon the wisdom and experience of my fellow Jeepers.

Thanks!

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Old 01-27-2011, 03:35 AM   #2
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Offset/Center, if you don't it will rub with your drive shaft I believe.

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Old 01-27-2011, 07:33 AM   #3
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FYI, I ended up going with the offset/center configuration at the recommendation of my muffler installer. It fits up there very nice and I have a straight shot back from the front to the back bumper and the tail pipe has been relocated to the left (driver's side).

Review of the Borla ProXS Muffler:
The muffler shop tried to talk me into a Flowmaster. He's been brainwashed by someone to think their design is the best. I did a lot of research on my own and even came across a dyno test of all the leading mufflers done on a Mustang several years ago. They compared straight through, stock, and everything in between. By the way, straight through performed worse than most mufflers. The Borla ProXS, which is considered the budget series by Borla, actually outperformed their more expensive models, according the this particular dyno. It also showed that the Flowmaster actually decreased horsepower and torque. That was all I needed... I bought the Borla. I should note that by decision was based on performance and sound volume. I wanted performance without setting off car alarms when I drive by. The Borla is also stainless steel and carries a 1 million mile warranty. Another plus.

I paid about $100 for the muffler. The guy at the muffler shop looked at it and said it looked like a typical straight through muffler, aka "glass pack". He wasn't impressed. After he was finished and started it up the first time, he was surprised at how quiet it was for such a small muffler. Louder than stock, but not the loud, obnoxious volume of most performance mufflers. Just a nice rumble at idle, barely more than stock, but a nicer tone. I then jumped in and headed out to run it through its paces. I immediately noticed the difference from the stock muffler when I took off. Louder, yes, and no more mini van sound. This sounded like I expected a Jeep to sound from the beginning. Again, not a loud hot rod, but more of a performance sound that was very nice - deep, rich, and just enough growl. Something else I immediately noticed, whether it is imagined or not I'm not sure, was it seemed to me that I accelerated with less effort. That I now took off smoother and the engine wasn't working as hard to get up to speed. Again, it might just be imagined, but after about a year, I still think it accelerates faster. Don't get me wrong... I'm not challenging anyone to a race at the stop lights or anything, but I am very pleased with the sound and performance I now have, imagined or real.

Here's a link to the Mustang site that I found the dyno info. Ford Mustang Muffler Comparison Test - 5.0 Mustang & Super Fords Magazine This is the best article and dyno test I've come across. I hope you find it as interesting as I did.

I also found this link that talks about back pressure. The truth about exhaust backpressure and torque
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Old 01-27-2011, 07:51 AM   #4
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Flowmaster 40 cat-back, I'm brainwashed too, I've used Flowmaster 40s/50s for over 20 years --And I'll keep using them-

If you don't like loud, use FM 50, although it won't fit where I have my FM 40, there's sound that gets close to the old V8 sound (not quite) with back rap/burble/great resonant pulses-

If you mount any muffler at the ass end where the stocker was--you'll never get any sound improvement and that position with the short exhaust secondary pipes will lead to DRONE !!





Right in front of the evap can, that gives you over 6' of secondary exhaust that sets of the pleasing (to me) loud resonant pulse "dual" exhaust"

CAN'TBEATIT

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Old 02-03-2011, 09:10 PM   #5
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Here's how mine ended up looking...




As I mentioned, this is the Borla ProXS that was almost identical in size to the Flowmaster 40 series, although it's quieter. The exhaust tip is also by Borla. I liked this shape simply because it was a little smaller profile than the typical round tips and the "fins", as I call them, would hopefully add some strength to the tailpipe in case I ever introduce it to a rock.
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Old 02-03-2011, 09:39 PM   #6
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Can you post a sound clip of the Borla, or a video? I'd love to hear how this sounds.
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Old 02-04-2011, 11:40 AM   #7
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I tried using my Logitec webcam this morning to record a sound clip but all I could hear was a hissing kind of sound at idle. Maybe my mic isn't designed for that kind of thing. Anyone have any experience recording an exhaust? What kind of system works best, short of professional sound equipment?
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Old 02-04-2011, 06:04 PM   #8
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The best results seem to come from a video camera placed about 4 or 5 feet back. I suppose you could even use an iPhone held a few feet away.
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Old 02-05-2011, 07:24 AM   #9
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I know a guy who does professional video production and he agreed to help me record something. I'll get it posted as soon as we get 'er done.
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Old 02-22-2011, 08:20 AM   #10
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Sound Clip

I finally got that sound clip. Eventually (maybe) I'll try to get one with a drive off, but this one will do for now...
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Old 02-22-2011, 08:47 AM   #11
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sounds really good
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Old 02-22-2011, 11:20 AM   #12
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Wow, that sounds great. I think that just rise to the top of my list.
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Old 02-22-2011, 02:40 PM   #13
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Sounds really good had a borla on my old tacoma and loved the sound .not in the budget yet to replace. but these northeast winters will make it wear premature ..loved pissing off neighbors at 5:00 in the morning when i left for work ..miss those days
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Old 06-13-2011, 06:17 PM   #14
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I need to buy that, I love that sound!!!!
I am new at this, Do I just go to a Muffler Shop? (What do I ask for?)
I have a 2007 JK 2 Door.
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Old 06-13-2011, 06:56 PM   #15
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Quote:
Originally Posted by bear3351 View Post
I need to buy that, I love that sound!!!!
I am new at this, Do I just go to a Muffler Shop? (What do I ask for?)
I have a 2007 JK 2 Door.
I had to buy it online since my muffler shop wasn't a Borla dealer. Once I got it, I just took it to him and he installed like any other muffler.
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Old 06-13-2011, 11:19 PM   #16
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Thank you DGriz,

What model number did you get, I see a bunch of them with numbers 403XX.
Magnaflow SS tip is the same for all of them, right?
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Old 06-14-2011, 07:03 PM   #17
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Do you remember what size the stock pipe is? Or if you have the model number, even better. That is all I need to order this thing. Thanks again.

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