Back pressure applies to naturally aspirated motors not turbocharged motors, back pressure would be fighting against your turbo that's why all the after market exhaust kits for these trucks use a straight through muffler design vs the baffled muffler design. Take all the thoughts of needing back pressure and throw it in the trash because it doesn't apply to turbo diesels.

Anything you can do to make a motor more efficient will benefit you in both power and mileage, if you can make an engine breath easier and exhale easier you are in effect making it more efficient. Not all changes will be drastic but they will be measurable differences.

 

I just literally finished deleting my cat and muffler so ill post on the next fill up how my mpgs are but anyway it goes wait til you hear the sound its sooo nice

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yup your mileage will go out the door,because it will sound so much better you will always be on the go button

 

Exactly right. Sounds so nice you won't be able to get your right foot to cooperate. Mine won't. :rofl:

 

Delete.....That's what I did at first before getting my 4 inch turbo back. I didn't lose any mileage driving normal. You could just punch out the cat and put pipe in for the muffler. May save you some pennies.

 

i love the sound of mine . i have a stock exaust with no cat or muff and its great i havent lost any mpg and the turbo sounds unreal !!!

 

I have an 06 with the 6.0 and i removed the cat and the muffler and my gas mileage decreased quite a bit. It didnt matter how i drove it, hard or easy it just wasnt even close. Now im going to agree with the other members on here the sound of a straight piped 6.0 is just the awesome. After 6 months of the loud exhaust i went back last weekend to the muffler shop and had them install my cat and muffler and the truck and my ears seem alot happier and my MPG has increased. At 4.05 a gallon that certainly works for me.

 

this thread is the reason I punched out a spare cat and kept my original. I read 10 post that say it doesnt hurt, then someone comes in and says it killed their mileage. Im not arguing either way, but data is data. There are lots of people who have ditched them, then came back due to the mpg drop. I personally have a gutted cat and mbrp muffler.I have yet to check my mileage since I did it. The way I see it, if I loose more than 1mpg Im putting it back. I know, we drive tanks and they get crappy mileage. None of us buy them to get 34 mpg out of. That being said, for the sole fact of sounding better, Im not willing to take a loss on MPG. Whether I have, has yet to be determined.

 

DENALI im not telling you to do it or dont do it, if you do it you will LOVE the sound. Redbandit98 you are right, I also read where people say it improves MPG because it frees the exhaust up and other people say it hurt them. I had to try it mainly to lower my EGT's. All i wanted to do was share my experiance with straight pipe. Im sure all trucks react different though.

 

mine goes in on the 12 to remove them both. I'm using the torque app to monitor EBP, and I'll see what it does to my normally horrible mileage

 

let us know nitrogen....i am going to play with my stock exhaust before i purchase my 4"

 

The shop didn't have good enough machinery to build the muffler delete. They were going to have to order the delete from an outside source. By the time they did thatdid it was going to be +350. For that price I'll save a few more pennies and just get a full 4 or 5 inch straight pipe

 

mabey take it to a different shop cause u should be able to do a muff delete for under 100 bux , its just a pipe ???

 

The price was parts and labor for cat and muffler delete. It def was more than my CFO aka wife was letting me spend. Prices here are prob a bit higher than in the USA too

 

i am from alberta aswell i live in a small town in alberta called stettler ...i tookmy truck to the only muff. shop in town and all they did was cut of the cat and muff. and weld on same size pipe and he charged me 116 bux . i was happy with the job and the great sound i have now its great . the owner of the shop told me the 6.0 or any diesel loves to breath . where are you located in alberta i am sure u can find a place to do the deletes for around 120 or so ???

 

Carstairs just north of Calgary. Just have to find another shop. Didn't want to go welded incase I want/need to go back

 

Doing a muffler and cat delete will make your truck run so much better! It will boost your mpg and lower your egt which will make your engine last longer.