Yukon Denali Exhaust & Air Intake

[CobraKiller]

Hi gang,

 

I took my 2002 Denali into the local dealership and told them I'm getting a whining noise from the front end. I was told this is normal for Denali AWD systems and there is nothing they can do.

 

Well, this gives me the excuse to drown it out with a new exhaust (Magnaflow) and air intake (K&N). Does anyone know if along with a small amount of horsepower increase, is there any increase in gas mileage with better breathing?

 

Thanks........