Sold.

 

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do you need a retune with throttle body

 

It will run fine without a retune, but it will run better with one. I ran it for a couple of months before I got my tune.

 

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How much of a power difference did you feel?

 

It definately made a difference, I couldn't say how much, but noticeable. It also made the intake sound louder with the CAI.
This is what BBK says about it:
"Whether you are the owner of a LS-1 Powered Corvette, Camaro, and Firebird, or drive the very popular GM 1996-Current Vortech or LS-1 equipped full-size truck, these new 80mm performance throttle bodies are a proven and simple way to bolt-on 8-12 horsepower in just minutes. Built from CNC-machined 356-T6 Aluminum Alloy, these new LS-1/Vortech Throttle Bodies offer the ultimate in Quality, fit, and finish."