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MagnaFlow Mufflers suggestions

srx70024

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srx70024 Enthusiast

srx70024

Posted
Posted

It seems that MagnaFlow mufflers seem to be pretty popular here, so I need some advice. I have a 95 Z71 stepside 350, currently with a Maremont Vortex muffler, single 3" inlet with dual 2 1/2" tailpipes. Thinking of going to a MagnaFlow muffler, single 3" in and out.

Should I get the 6" round straight through or the oval muffler?

The round one that I was looking at had an overall length of 20" and a 14" body length. That's a pretty small muffler isn't? Might be too loud ?

I'm also putting on a high flow cat.

 

Any suggestions would be greatly appreciated.

 

 

Thanks all !! :jester:

bigtruck21 Enthusiast

bigtruck21

Posted
Posted

If you don't want as much highway drone, get the bigger oval muffler. Go to magnaflows homepage to get your suggested application. Why do you want to replace your current system? Not enough lowend torque with the duals or sound?

srx70024 Enthusiast

srx70024

Posted
  • Author
Posted

Thanks for the input. I'm replacing the existing system because it's beginning to rust out. I like the Vortex muffler, but it did not last long and they don't offer a stainless muffler. And, yes, I am looking for a little more low end with a single in/out. I've heard the MagnaFlow's sound nice and plus they are stainless. The rest of the system will be custom stainless also.

Which size oval should I look into, the 5x8 or the 4x9 ? The round mufflers have a hum or drone to them on the highway ?

 

Thanks. :thumbs:

Chris97K1500 Enthusiast

Chris97K1500

Posted
Posted

My guess would be the 5x8 would be slightly quieter than the 4x9, just based on the area of each muffler. The round ones that I've heard are alot louder than the oval ones. My dad's truck has a round Borla muffler on it (it was on there when he bought it). Much louder than mine with an oval Borla muffler and we have the same truck. Mine measures about 15x9 (body of it) with the inlet/outlets making it about 20". Not very big compared to the stock one! I also went with the single out side exit, didn't want to lose low end! The magnaflow site is pretty detailed about different applications. :thumbs: Chris

DeezBlueZ Enthusiast

DeezBlueZ

Posted
Posted

I agree with Shortcrew, I believe I was reading on another forum about the people with just the Magnaflow muffler and the stock tail pipe. They all agree that it is a sweet set up. I believe the muffler they used was the SUV/truck muffler measuring 5" x 11" x 22". This will eliminate most of the droning at cruise speeds.

  • 3 weeks later...
cowboy02 Senior Enthusiast

cowboy02

Posted
Posted

Anyone here on this forum have the 5x11x22 Oval Magnaflow mufler with Dual in Dual out on a 5.3L Vortec?

 

I'm looking to get this installed in the comming weeks and was wondering about drone and resonance.

 

Is it better to have a dual in dual out? or a dual in Single out? or a single in dual out? or the last option single/single?

 

I Think a dual out would be the best since I'm going to be running duals to the sides.

 

What do you all think??

 

THanks.

bigtruck21 Enthusiast

bigtruck21

Posted
Posted

what's going to matter is the exhaust flow. You want it to flow freely but still have enough backpressure for lowend tq. Calculate the inner area of the different size pipes and take into account the number of bends (which adds resistance). I don't know what the perfect number is for the 5.3. This is probably why I haven't changed out the stock exhaust yet. I wish I had a dyno.

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