Magnaflow muffler

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Is there any down side to this?

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Besides making you look like a douche bag?

I had some magnaflows on a 2004 5.4 f150. Very mellow rumble at idle, and nice sound when WOT. I had the regular mufflers which aren't aggressive at all. As a matter of fact they bordered on being too quiet, but I liked them at the time.

I have one on my Sierra. Gives it a nice deep rumble at startup. For around town driving, its not really noticeable until you mash the skinny peddle to the floor.

I have one on my truck. They are pretty much the only company that makes a 2 into 1. Sounds a little louder than a Denali at idle, but louder when I'm on it (not too loud though).

My truck drones between 1850 and 2k, but the 6.0 tends to do it with any aftermarket exhaust

I have a Flowmaster 50 catback system on my 2010 Yukon Denali. It's got a great sound at startup and under heavy acceleration. But at highway cruising speeds and at idle it's pretty quiet.

I don't know a ton about the Magnaflow systems but it at least appears to me to be a glasspack in the shape of a muffler. Flowmaster does true muffler designs as opposed to just glasspacking it. Then again I haven't shopped for a Magnaflow in a long time.

I used to worry about sounding fast.
Now, my truck can be whisper quiet as long as it hauls arse.

A muffler doesn't know if it's welded to a pickup or an SUV, or a 600 horse muscle car.

There is far less drone from a through style muffler such as a magnaflow when compared to a chambered muffler such as your typical flowmaster.

Magnaflow cutaway


Flowmaster cutaway


Magnaflow mufflers are slightly similar to glasspacks, but are not glasspacks. They are filled with an acoustical sound deadening material, but it's not the same as the stuff you'd find in a cherry bomb/thrush/purple hornie style old school glasspack. Glasspacks burn out over time and use, while magnaflow and similar mufflers from other manufacturers (dynomax, spintech, borla, gibson, etc) have developed materials that are very resistant to deterioration.

Nearly all manufacturers offer configurations for many applications, with differences in inlet/outlet diameter and quantity. Magnaflow is not the only, or even one of the only mfr's with dual inlet/single outlet offerings.

In the same way, there are various case sizes and shapes, like round case/oval case, and anywhere from 12" length up to and beyond 24" length. Figure that the bigger the case, the more sound will be "muffled" out.

There is an entire scientific discipline to this, and the information I've posted barely scratches the surface. If there is a certain sound you're going for, listen to clips on youtube, making sure to note the specifics, because other factors also determine the sound coming from the tailpipe (manifolds/headers, catalytic converters, pipe diameter, etc). If you hear one in person that you like, ask the owner to tell you what he's running.

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glasspack

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As I recall, you're supposed to get them good and hot and run a cold waterhose in there to break out the sound dampening material.

I used to be indifferent towards modified exhaust. Then I moved into a shop where my next door neighbor has a dyno where the bay faces my shop, now I fricking hate the sound.