Cutting off muffler VS 4in Silverline

[4wdaaron]

if you have the money the 4" is worth it. not sure if you will see a lot of mpg increase with cutting out the muffler. you will get a very small bump in mpg with the 4" but nothing to write a book about. I think the duramax sounds awesome with a 4" turbo back compared to just a muffler delete. but to each his own

What kind of mpg gain are we talking with a 4in? Honestly any over 1mpg??

 

[jcool]

What kind of mpg gain are we talking with a 4in? Honestly any over 1mpg??

honestly. maybe 1 mpg. I return an average so far this year of 20.43mpg and a high of 24mpg on a trip. I use virginiabeachgasprices.com fuel log to keep track of my mileage. The tuner set on performance has definatly been what increased my mpg noticably though.

 

[GMCYA]

What kind of mpg gain are we talking with a 4in? Honestly any over 1mpg??

About tenfold on the coolness factor and lower EGT's by about 200* when towing. That's about it!