Prolly 39 degrees last night and me and parke10 are driving back to the dale(oildale) and had some runs on coffee rd.. Usually I spin(4.11 yukons), parke10 doesn't, then I can't pass him till around 80 or 90mph. Pre header and cat delete I could take him by 60mph. Earlier in the day I got on my HPtuner and deleted all my bad codes. I had cat codes, egr codes and air injection codes. Turned off pretty much all the smog stuff. People told me that they were just ses lights and wouldn't effect performance. Drives way better now. Like it did b4 header install and cat removal but with better top end now. Oh parke10 went down..AGAIN

His reign of more power due to AEM intake install was short lived.

 

parke10 , no hard feelings bro

 

so do most yukons have 4.11 or 4.10's because my uncle picked up a 05 yukon denali xl and was telling me how it turns a few more rpms than his old silvy which is mine now. i meant to look in the glovebox and see what the code said but never have.

 

opps, i meant to say I have "Yukon Brand" 4.11 gears. I don't know what size gearing the GMC Yukon has

 

yea yer still an ******* soon as i get the same mods as u even without gears, thatll be a whole new story haha

 

One of these nights we'll have to hit it up. Sorry about not responding to yer pm, I didn't see it until about 3 hrs ago.