Kind of curious about this muffler. Looks similar in size to stock. I would like to find something that would free up the flow, keep the interior noise to a minimum and be a "little" louder than stock. Think this one would work?

http://www.flowmastermufflers.com/70_series.html

i woudl got for a 50 series, they are not that loud

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2004 Liberty Renegade
Silver, loaded
Full skid plates
255/65/16 yokohama Geolander A/T-S
Tow hooks
Flowmaster super 44

Seems like a popular muffler is the 50 series SUV muffler. I've been to a couple of local muffler shops looking around and found that it is hard to make the 3.7 6 cyl have a good deep sound. I don't want the revy Japanese vehicle sound. I'd rather keep it stock than have it sound that way! Interesting, one of the muffler shops that was familiar with the 3.7 said that the stock muffler was sooo HUGE to allow an expansion chamber to deepen the tone. I have to admit that the stock muffler does give a pretty good deep tone, but just not loud enough. So, that was my thought on the bigger 70 series muffler!

Hey! Did you ever go with the 70 series? I have a super 40 and it sounds good at idle and cruising speeds but throttle is iffy sometimes. Too much throttle and it sounds like a tin can under there!
Ill be looking to upgrade, again, soon!

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Pre-Lowered 02 Liberty
2.5" Rustys Coil w/ Ranchos in the rear.
ARB, OME927's, 1/4 strut plate and Als Gen 4.5 Uppers in the front.
Flowmaster Super 40 Series (GONE, SO QUIET!)
245/75/16 Kumho KL-78 w/ Spidertraxxxxx
Ripped out the plastic inner wheel liners
Herculined ALLLL over.....

id be interested to hear a sound clip too. my 3.7 with a glasspack sounds awesome at idle, but drones when cruising and under throttle it sounds like a raspy vacuum cleaner from hell.

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2006 Sport 4X4, Deep Beryl Green, NSG370, NV241J, Lifted with OME 927/948 and Bilstein, JBA 4.5 UCA's, Custom 3" Rear Y-Link Extension and Swaybar Relocation, 265/75-16 Toyo Open Country AT2 tires, Black Plastidipped bumpers, flares, and doors, Pioneer speakers, Alpine head unit, 1200w Phoenix Gold Amp, 12" Dayton Reference sub.

If your just changing for the sound fine, but no one I've seen with a dyno has seen much difference between stock and anyone muffler. The stock exhaust is very well designed as is.

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No one knows as much as all of us.