I have for sale a Superchips Flashpaq 2865 for a Chevy Silverado. I used it for my 2013 5.3. Worked great...my favorite was the 87 tune. Better throttle response, noticeable power difference, and increase in gas mileage. I no longer have the truck which is why I'm selling. I bought it earlier this year so it's pretty much new. I have the original box, manual, etc. $250 shipped. PayPal only unless you're local.