eohat
In Torque We Trust
If your doing a straight swap @eohat you don't need anything. Use every thing from your 5.3. I did and it ran great on the 5.3 tune also. But if you have a heavy foot it will lean out and pop #7 piston. (Never experienced it but read it)
I recently discover that if you want to use the exhaust off a escalade or Denali the drivers side exhaust manifold is different. Keep that in mind for future mods. I am adding the magnaflow cat back system for the escalade but need to change the front pipes. Couldn't cause of the manifold. Any help you need don't hesitate I will do my best to help
Thank you sir, appreciate that.