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  #1  
Old 01-30-2011, 12:06 PM
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Default Exhaust necked down?

Recently had a Magnaflow muffler put on my 2007 Ram 1500 5.7 Hemi... Question is... The place where I had it installed necked down the exhaust from 3" to 2 1/2" before and after the muffler. The Magnaflow has a 3" inlet and outlet, so I saw no need to do this. Their explanation was that it needed to have a slight back pressure similar to what a regular muffler creates... I'm not sure if they were just saving money on 3" pipe or if this is true, any thoughts?
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Old 01-30-2011, 12:15 PM
erm
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I guess I don't understand but if they necked it down, how the heck does it fit in a 3" hole? What was necked, the muffler or the pipe going in and out of the muffler?

If they necked down the muffler inlet/outlet so it would fit then does that mean your pipe is really 2 1/2"?

Or did they just crimp the pipe some?

As far as having enough backpressure going to a freer flowing muffler, not really needed. You have plenty of backpressure with the stock pipe.
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Old 01-30-2011, 12:38 PM
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I've attached two pictures of the exhaust and muffler where it shows the original 3" exhaust and the 2 !/2" pipe welded into it... They didn't even crimp the pipe, just stuck it in the hole and welded...
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File Type: jpg IMG_20110130_122736.jpg (123.3 KB, 41 views)
File Type: jpg IMG_20110130_122746.jpg (125.4 KB, 38 views)
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Old 01-30-2011, 12:45 PM
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hmmmm...so the pipe is 2.5" and the muffler inlets are 3". Normally a reducer is used at this junction. The pipe is consistently the same size down stream of the muffler, i.e., it's 2.5" out to the back?

Honestly, and don't take this personal, but that's some shoddy work.

Last edited by erm; 01-30-2011 at 12:51 PM.
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Old 01-30-2011, 12:49 PM
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Yeah, I know... I don't weld, and think I could have done better... Bought it used and it was a straight pipe from the cat back, just a little too loud. Had this put on and lost 2-3 mpg...
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Old 01-30-2011, 12:52 PM
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The back looks just like the front, 3" out of the muffler for 2-3 inches, then reduced to 2 1/2" for about a foot, then back up to the original 3"... My guess is they didn't have any 3" pipe at the shop, so just made do with what they had... I'll be paying them a visit this week!
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Old 01-30-2011, 01:48 PM
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Yeah, I would be going back and making them fix that. No offense, but that weld job looks like shyte, and the muffler hangers are pretty shoddy too... if that was my truck, they'd be getting an earful from me...
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Old 01-30-2011, 02:15 PM
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IMHO, if I would have purchased a muff with 3" in/out and wanted it installed in an existing 3 inch exhaust system, I would have thought that it was 'idiot proof',,,,

After seeing this,,,,,WTF???!!!!????

FWIW, 4th Gen OEM head pipe size w/single or dual tailpipes is a single 3 inch all the way from engine 'Y' to the muff.

4th Gen OEM single tailpipe is 3 inch dia from muff to tip. This 'installer' evidently believes you need a 2 1/2" exhaust system,,,

Absolutely no reason whatsoever that you 'need' anything different than 3 inch all the way!!
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Old 01-30-2011, 02:40 PM
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My thoughts exactly...
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Old 02-01-2011, 10:37 PM
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Apparently that shop has no idea what they are doing. Honestly I wouldn't go back to that horrible shop. I would go to a new shop tell them what happened, and get them to fix it.
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