[joecool4511]

new to the site just bought a 2013 Denali HD with a duramax what kind of upgrade are best for this vehicle, performance and milage

 

[quiksilverz71]

Welcome to the forum!!!

 

[barrrf]

Cool pics bro! Great intro! Welcome!

 

[GMC HD 4x4]

are you staying legal? If so I have done the CAI S&B with a a MBRP 3" Down pipe. EGT's have dropped as for mileage 16.5 in town

 

[500whptahoe]

Welcome, nice to see someone thats at least in the same state. As said the intake and down pipe are the best legal ways to go about it. I get 16.5 in town on 35s and 24 on the hwy but i have efi live as well