[ronrrp]

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?

 

[Guest]

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.

 

[ronrrp]

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...

 

[Guest]

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.

 

[ronrrp]

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...

 

[ronrrp]

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!

 

[USMCRONIN1]

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...

 

[HoustonHemi]

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???!!!!???? :doh:

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,,, :4-looney:

Absolutely no reason whatsoever that you 'need' anything different than 3 inch all the way!!

 

[ronrrp]

My thoughts exactly...

 

[Chance05Ram]

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.

 

[Toms Blue Ram 1500]

That muffler looks like it's been on there for some time . I've seen better workmanship . Everybody is weld happy today . Now it's gonna be a bad job trying to get the muffler off without destroying it .

 

[HoustonHemi]

Still trying to figure this one out,,,,,

Just a thought,,,,,

I wonder if the installer did all this 'reducing' just to be able to align the parts without having to bend any pipe?

In the 2nd pic, the pipe enters the muff at an angle,,, Ya suppose it was made 'small' on purpose just to avoid having to properly line everything up??? (1st Pic looks a bit 'off' as well)

Lots of 'slop' with a 2 1/2" pipe stuck in a 3 inch inlet,,, Angle of entry wouldn't be very critical if your installers 'game plan' was to just stuff a pipe in anyway he could and goober weld it in,,,

Are the 2 pieces of pipe the installer used straight w/no bends???

I see a 'flare' on the leading end, but my guess is the pipes and muff this installer put in are mostly out of alignment at the connections,,,, If this is the case, using 3 inch pipe would appear to have been impossible without first bending it to properly align with everything,,,

Don't tell me this is a "jerry-rigged" install passed off with a 'needs backpressure' excuse,,,,

If the installer tried his best and still did crappy work, that's one thing,,,,
Not knowing any better is another,,,,,, But doing jack-leg work and passing it off as 'needs backpressure' would chap my azz!!!!!

 

[ronrrp]

I'm convinced they have no idea what they are talking about, nor what they are doing... I brought it back to them and they told me I needed to complain about it when I picked it up... Didn't know I was going to lose 2-3 mpg until after...

I think he did it the easiest and cheapest way, chalk it up to another lesson learned...

I figure I'm going to hold off and get a dual exhaust put on... At a different shop!

Thanks for your thoughts...

 

[916Timmy]

Any money back, or corrective work done? I would blow that place up!!!