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Old 11-04-2013, 09:27 PM   #1 (permalink)
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Default Flowmaster Super 44,

I'm on Flowmaster's site right now looking at their Super 44 Mufflers but I have no idea what IN/OUT means, and I'm confused about the C/C, O/C, C/O, O/O, O/O SAME SIDE. I'm planning on purchasing the 2.25". Any help would be greatly appreciated.

Here is the link.
SUPER 44 SERIES FLOWMASTER DELTA FLOW MUFFLERS
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Old 11-05-2013, 05:32 AM   #2 (permalink)
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C= centered
D= double
O= offset

An example: an "O/C"...the first letter is the inlet side, the second the outlet side.
So that would be an "off-set inlet, centered outlet" muffler.

"In and out", simply means the DIAMETER of the inlet (exhaust pipe) and outlet (tail pipe) that the muffler will accommodate.
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Old 11-05-2013, 09:04 AM   #3 (permalink)
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It's gonna be loud...

I should elaborate. I have used flowmasters in the past for many applications and my number one complaint with them has been excessive interior droning in most cases. The Sami is a short vehicle but poorly insulated. Mine drones and it's fully rattle trapped and carpeted

Your performance gains with a flowmaster over a decent universal quiet muffler will be negligible at best.

I bought my Samurai with 2.5" and Flowmaster and it was unreasonably loud and raspy so I removed it and went to a 2.25 using new universal Magnaflow cat and muffler. It's a big improvement but I'm still going to fashion some sort of silencer at the end for street use. That constant monotonous howl does get old after a while, especially with the ragtop.

Expect a Flowmaster alone to be loud with high levels of interior drone, especially at highway speeds. If I could go back and do mine again (ie. I didnt weld the whole thing up) I would keep the universal cat and use a decent quiet muffler.

If you dont hit the highway often it might not be so bad.
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Old 11-05-2013, 09:15 AM   #4 (permalink)
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I think you're right CJ.

There ARE other (quieter) model options over the Super 44 if he desires.

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Old 11-05-2013, 10:54 AM   #5 (permalink)
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I'm quite fine with a loud noise. My father has two older model pick ups (67 & 65) both with Cherry Bomb mufflers thrown underneath'em and I never get tired of waking up to it. Oh, and about that drone on the interior. Is there anything I can install that will make less rattle or none at all? Thanks for all help and info guys!
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Old 11-05-2013, 11:10 AM   #6 (permalink)
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A droning sound is a resonance, not so much a loudness. And a pick-up truck comparison falls short, since there is a divorced / open bed back aft.

It's the enclosed cabin confinements of a conventional vehicle that retains and amplifies a droning effect. And it ain't fun to experience. It'll give you an actual headache.
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Old 11-05-2013, 11:17 AM   #7 (permalink)
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I see... so is there any way to stop the droning? Or make it less severe?
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Old 11-05-2013, 11:26 AM   #8 (permalink)
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This will have a high rice factor over an old school high compression V8.

To minimize interior drone you might see if you can position the muffler further back and have a look at other mufflers posted by Max. With a 2.25" and no cat even a quieter muffler will deliver ample exhaust note. A couple things that make this a bit louder is the fact that its a very short exhaust system (makes quite a difference) and probably has no cat.

Mine sounds pretty good and not to ricey configured as it is and I can listen to Tom Leykis at 70mph without going deaf (if no hills or headwind) but I would actually like quieter.

Keep us posted on what you choose and the results.

Oh yea, I have dynamat like stuff (rattle trap) on floor and sides with full carpet, it did help but I did it for temperature insulation as well as sound (AC equipped)

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Old 11-05-2013, 11:29 AM   #9 (permalink)
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Quote:
is there any way to stop the droning? Or make it less severe?

Extensive undercoating application or a sound deadener like Dynamat on the inside floors & sides. A lot of work and expense though, that MAY make the droning manageable.

Another option is to add an additional small muffler / silencer later to the end of the tailpipe, if you feel it's too noisy with just the Flowmaster.
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Old 11-05-2013, 11:40 AM   #10 (permalink)
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Alright, well I will be purchasing me some Dynamat then! I'm going to stick with the 44's but I'll be careful about the drone. I'll keep you posted on the results and record a video for further review. Thanks for all the help!
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