Performance upgrades?

[Kbjones]

Hi All, 

Im new here and was hoping to get some advice on doing some performance upgrades on my 2012 GMC Sierra 1500. 5.3 liters. Just to share some trials I have experienced with this truck. A couple of months past the 5 year warranty #7 cyl lifter collapsed! What a terrible design! GMC didn’t do anything to compensate me for the problem that I’ve come to learn is a frequent one. I replaced the lifter. Now I want to delete the Active fuel management (AFM). I was thinking of using this programmer.(DiabloSport 8245 inTune i3 Platinum Performance Programmer 3rd Generation inTune inTune i3 Platinum Performance Programmer. Any feedback on this would be awesome. Also the shifting on the transmission is very rough.(it drops down a gear  and would like to throw me and my passages through the windshield!) I would also like to put a cold air induction headers and new exhaust. If any of you have tips On the brand would be appreciated. And do you think I should put a performance chip in also? Any Advice would be greatly appreciated. Thanks Ken. Also I would like to note that my truck only has 50,000 miles on it. I still can’t believe GMC would’nt of helped  me out somewhat. 

[diyer2]

Sorry to hear about your troubles.

My 2012 Sierra 5.3 6 speed bought used with 41K miles, now at 70+ K miles has been great.

I have been keeping it out of 6th gear so no AFM activation.

Trans shifts smooth.

 

I have done 3 K mile oil changes.

 

Trans has had pan drop and filter.

Fluid exchange through dip stick tube.

 

 

[It's Tim]

Only 1 lifter was wiped and the cam isn't damaged?