[Headers On My 2011 6.2]

I know this post is over a year old but i have the exact same set on on my 2011 denali, ARH headers and high flow cats.......... i have the exact same swoosh sound while shifting. But i also have dual flowmaster exhaust.... guess its just normal

[2011 Silverado Maxx]

Wow, you get 16mpg with your 6.2? Thats pretty good. If you tune it you void your warranty im sure, right?

 

 

ya but they have to prove that tune caused the failure by law, it could bite me in the a** but with my experience with GM trucks i shouldnt have to worry before 100000 miles anyways on the powertrain

[2011 Silverado Maxx]

i have a 2011 denali with the 3.42 gears and raced an silvy ss with LT headers and a intake. i was beating him by about two links and still pulling on him when i let up. i just have a tune intake and flowmaster dumps. just make sure u get a tune gm really chokes the 6.2's up with the engine abuse management and a tune really wakes them up, i also get much better gas mileage with the tune (around 16 in city) when i stay off it