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Old 02-09-2011, 05:46 AM   #1 (permalink)
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Thoughts on this muffler?

http://www.summitracing.com/parts/WLK-17651/

This muffler fits the size requirement and price requirement I need. It will be behind the skid plate so toughness not an issue.

I want it to be quiet!!!!! Anyone run one of these? 4.0l engine
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Old 02-09-2011, 08:13 AM   #2 (permalink)
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It is a welded muffler, it will not be quiet.It's a Flowmaster 40 copy, really. And it's not that great quality, either.
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Old 02-09-2011, 12:17 PM   #3 (permalink)
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Okay ... you say its a welded muffler and that is going to make it nor as quiet. can you explain this?
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Old 02-09-2011, 03:54 PM   #4 (permalink)
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It's a chambered construction, no packing. Only steel baffles. LOUD.
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Old 02-09-2011, 03:59 PM   #5 (permalink)
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Magnaflow. I have one on a 4.2 with 4.0 head and it isn't that loud. Doesn't even sound that bad on the I6. Flowmasters sound like shit.
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Old 02-09-2011, 05:46 PM   #6 (permalink)
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Dynomax super turbo, they are nice and quiet, flow good, and are reasonably priced. I have one on my YJ and it's good.
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Old 02-09-2011, 05:58 PM   #7 (permalink)
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It says Thrush on it, that should be enough to know that its loud.
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Old 02-09-2011, 06:07 PM   #8 (permalink)
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I have this thrush muffler http://www.summitracing.com/parts/WLK-17713/ on my rig and its pretty quiet. But then again my 4.0 has 3 cats before the muffler......
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Old 02-09-2011, 07:02 PM   #9 (permalink)
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The Thrush in the original post is a Chinese Flowmaster copy.

I bought one 3-4 years ago, and the tubing size was way off.
It was supposed to be 2.5"ID, I'd say it was 2 5/8" ID, or more.

cliff notes:
It's loud like a first gen FM, it's cheap, made in China, and sometimes they screw up the tubing sizes.
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Old 02-09-2011, 08:19 PM   #10 (permalink)
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Quote:
Originally Posted by jeeperman19 View Post
I have this thrush muffler http://www.summitracing.com/parts/WLK-17713/ on my rig and its pretty quiet. But then again my 4.0 has 3 cats before the muffler......
WTF? Why?
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Old 02-10-2011, 04:19 AM   #11 (permalink)
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i just put a 40 series flowmaster on my jeep with on cat. it's loud. i would suggest you look into like a 80 series or a hush power (i think it's called) from flowmaster.
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Old 02-10-2011, 05:45 AM   #12 (permalink)
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Borla ftw...
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Old 02-10-2011, 06:42 AM   #13 (permalink)
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I took off flow masters and installed a single hush its much nicer... $130 bucks, but ceramic coated and a lot quiter.


http://www.hushpower.com/
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Old 02-10-2011, 07:46 AM   #14 (permalink)
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Just ordered the exact one from Amazon same price but with free shipping.
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Old 02-10-2011, 09:11 PM   #15 (permalink)
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Quote:
Originally Posted by cj7sswampers View Post
WTF? Why?
Commyfornia........I swapped a 4.0 out of an 01 xj into my cj-8. The 4.0 has 2 pre cats just south of the manifold, it y'stogether into the main cat.
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Old 02-10-2011, 09:18 PM   #16 (permalink)
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I have a Hushflow or whatever its called on my YJ 4.0. Has just enough sound to know the motor is running right but not so loud you can't hear the radio turned down at an idle. At highway speeds the tire noise completely covers any exhaust noise what so ever. Hope this helps I'm not one for loud exhaust personally.
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Old 02-11-2011, 05:14 AM   #17 (permalink)
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Originally Posted by Mr. 95YJ View Post
I have a Hushflow or whatever its called on my YJ 4.0. Has just enough sound to know the motor is running right but not so loud you can't hear the radio turned down at an idle. At highway speeds the tire noise completely covers any exhaust noise what so ever. Hope this helps I'm not one for loud exhaust personally.
Hushflow?? You mean hushpower?? What brand is your muffler? Sounds like what i am looking for.
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