[Brandonlee]

How much improvement would you see if you cut the muffler off of a 03 duramax that is factory. Would it be a noticable amount or not worth the time.

 

[ratlover]

Power? Not enough to worry about. EGT reduction though. It definatly wont hurt anything. Just take a bit of time and just a few $.

 

[kziggy]

i could tell a diff.

 

[Peat]

you will notice a small gain in throttle response and mpg and a huge drop in egt. Do it.

 

[Brandonlee]

Cutting of the muff Will it make the turbo more noticable without the muff and what is the different mpg difference if any.

 

[Brandonlee]

Has anybody replaced the rear u-joint in an 03 d-max if so how much of a pain was it and what is the price of the u-joint usually run.