Hello,

This is my first post on EFI live and i was told to come here for advice on tuning. First, my truck is an 2007 GMC Sierra 2wd 5.3 SLT.

My truck came standard with the active fuel management and would like to know how to disable this. either through tuning or buying a programmer. (I understand that gas prices are high) I have an aftermarket exhaust, so when the truck switches into 4 cylinders on the highway, the sound is horrible. The exhaust is a magnaflow, changed from flowmaster since i thought it would be quieter.

If there is any way to disable, please let me know.

Thanks.