Headers question

[chevy7777777]

I have a 2009 4.8 silverado with only upgrades being a k&n CAI, Flowmaster dual exhaust and I was looking at purchasing some long tube headers for it. Is this worth doing with just the upgrades I already have? Do I have to do anything else to my engine if install them? Looking for some more throttle response and torque.

[Chris]

If you do, have it tuned with someone who does custom tunes. Also to keep throttle response, dont go bigger than a 1-3/4" primary

[chevy7777777]

Okay. There's a place not far from me that professionally tunes. Am I going to notice a throttle response gain with headers? Do I need to install anything else if I put these on other than what I already have?