Okay here goes i have been working on this for some time. i am new to tuning and read more and more. what the set up here is a 2010 silverado 4.8 rear mount 68mm turbo. mod I have done is short headers, removed cats, turned off rear o2's 1.85 crane rockers (kit with hardened push rods),new maf calibrated for 4inch inlet tubing. the truck runs good but can be better i just dont want to tear it up as i drive it daily 120 miles plus going back and forth to work. if i need to add any more info let me know. the knock is at 1.40 g/cyl and my timing table stops at 1.36 g/cyl thank you