Muffler Delete = $$$
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FTE-Spread The Knowledge
Joined: Feb 2008
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Muffler Delete = $$$
I keep everything perfect maintenance wise, but still was slowly getting less mpg. Did muffler delete and instantly made 4 mpg better, calculated twice. I am back to 18.9 mpg.
Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
I hear that the stock muffler doesn't help the exhaust flow but not to that extent. I installed an MBRP 4" exhaust with muffler and my mileage went up a smidge but nothing to write home about.
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,235
Likes: 753
From: Houston, Texas
If you're going bigger and still have stock injectors, it pays to get a kit that goes from a 3.5 inch downpipe out to either a 4 inch or 5 inch if you desire. It helps the turbo spool and maintains the bottom end power even stock. I'd only run a full 4 inch downpipe if you had Stage 2 or 160/100 injectors and above.
Senior User
Joined: Jan 2012
Posts: 224
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From: Somewhere in Virginia
I just installed that 1 on mine....no mileage increase.....
Elder User
Joined: Jun 2012
Posts: 536
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From: N. Va.
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FTE-Spread The Knowledge
Joined: Feb 2008
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I will run everything stock as long as it continues to work. 300k and 18.9mph is all I want. Thought I would share my success. We did tbe calculations again and we are .157mph difference after 3 times.
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Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
If you're going bigger and still have stock injectors, it pays to get a kit that goes from a 3.5 inch downpipe out to either a 4 inch or 5 inch if you desire. It helps the turbo spool and maintains the bottom end power even stock. I'd only run a full 4 inch downpipe if you had Stage 2 or 160/100 injectors and above.
Anything above 1500rpm on mine and it becomes noticeable. Get above 2000rpm and the drone drowns out the injector noise.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
Agreed. The only thing a muffler delete changes is the decibel level.
Lead Driver
Joined: Mar 2004
Posts: 5,372
Likes: 108
From: Northern Indiana
4" exhaust for me gained my no noticeable improvements besides maybe a small drop in egts. Other then that just A lot louder. If I gained 4 mpg on mine I would have figured a way to install two 
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,235
Likes: 753
From: Houston, Texas
What I'm driving at is that a 3.5 inch downpipe fits much better than a 4 inch downpipe. From the 3.5 inch downpipe, you can go 4 or 5 inches the rest of the way, to the back of the truck.
Lead Driver
Joined: Mar 2004
Posts: 5,372
Likes: 108
From: Northern Indiana
I have a vibration that has popped up lately in my truck. I am thinking the down pipe is rubbing somewhere. Gonna have to try and get a better look. There defiantly isn't much room to squeak a down pipe in there.
Senior User
Joined: Aug 2012
Posts: 307
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From: thornton CO
I think it's funny every time I hear about the dramatic mpg increase people get with somewhat minor modifications. I went from a bone stock truck to everything in my sig and see next to no increase in mpg.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,344
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From: Lake Hartwell, GA
Honestly, I have done a ton of improvements to my truck and frankly don't give a damn if I see a MPG increase. It would take years before that money is recouped simply based on the cost of the modifications/updates. I do know though that the truck is running much better now than ever and it gets the same work done I ask of it much easier than it did the day I bought it.