Proven Flowmaster brand

None.

I went with the Flowmaster 50 series Delta Flow using 2.5" piping. The
Flowmaster does indeed put out a low, mellow rumble that was to my liking.
Also, the interior noise level was very minimal during highway speeds. You
do hear a low hum inside the cabin, but it is far from annoying. In fact, the Mrs. didn't even notice it till I pointed it out to her. Passerbys will hear a low mellow to deep rumble, but don't expect to sound like a Magnum V8 engine cruising down the street.

It was money well spent. Thanks to Todd over at Exhaust Works in Belmont, CA, for doing an excellent job.

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power, sound, not too loud, bang for buck.

none, flawless

I baught this flowmaster muffler 50 series from paw inc. for 90 bux and got it installed in a muffler shop with a tip all welded total for 35 bux. It has a nice deep sound, its not too loud but perfect. its noticable and it turns heads. the muffler sounds a lil like a borla cat back. it was worth the money. i noticed some low end power and i havent checked up on the milage per gallon but since i got it ive been gassing it more so ive been loosing gallons. but i want to hear how the 40 series wood sound on my car.. i wouldnt want n e thing quieter than a 50 series. Flowmaster all the way.

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dont buy cat back on wrangler, pipe is very short and it deosnt even make a difference.

The sound is great! Sounds good burbling around town, and when you nail the throttle, it roars.

NONE

I just had a custom dual exhaust system put on my '90 Ford Bronco. I chose Flowmasters because of their quality and sound. I plan on swapping a EFI460 into my Bronco, but people want to see the "460" in it! Funny thing is....currently,it only has a stock EFI302,wearing 2 1/4" dual exhaust! Not even a set of headers on it's 302! Awesome big-blockness tone!And the power of the 302 is better,too.

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Why bother using any other mufflers?!

mellow sound while cruising,good bark when on it,decently priced

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We run a 1950 gmc with a 406sbc.The engine is running a six inch connecting rod with 11.6 to one compression and pro action heads with a roller cam with a 250 horse nos kit.We cruise and race this truck so we wanted something reasonably quiet that wasnt restrictive.We are very happy with the dual 3" flowmasters as it has a deep mellow sound while cruising and when we have it set on kill it has a wicked bark.

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Awesome sound, durability (it never ever rusted) and increase in Horse Power!

None that I ever became aware of.

I opted for a Flowmaster 50 series mainly for it's sound. I had an 89 Iroc-Z with a stock muffler to begin with. I wanted a deep throaty sound though, and I just wasn't getting that sound with the stock muffler. To my surprise, when I made the upgrade, not only did I get the sound I was looking for, I also got an increase in HP. I got SO many compliments on the sound!!

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Friends have told me that the Flowmaster out ranks Dynomax and Borla by a long long shot!