I've just finished getting my 2008 silverado 1500 installed with a 5.3 liter, 4l60 trans, with 4.10 gears. I've got a LS9 cam, 3" headers, 3" exhaust, TBSS intake 90mm TB, 2800-3000 stall converter. I've got a tune in it that has a great top end charge starting around 3k-3500 rpm. It's a dog up to that point. I've seen older threads on this, but I can't open the attachments that seem to correct this issue. I'm guessing I need to check my timing down low, but is there anything else I can check to get more power out of the program? Thank you in advance for any help with this. I'm very new to the programming side of this build.