If you're looking for ways to modify your 1997 through 2004 C5 Corvette you probably discovered that there is not a whole lot of aftermarket support for the LS1 engine.
If you do not want to switch to a later engine but you would like to run they later LS2 throttle body for increased performance you can use this adapter harness to do just that.

With this harness, it will allow the use of a LS2 throttle body on an LS1 vehicle.
This harness is comprised of OEM connectors, terminals, locks, and seals to allow complete plug and play installation and adaptation.
Adapts LS2 Drive by Wire Throttle Body Adapter Harness for LS1 Vehicles - C5 Corvette and CTS-V

Notes: Adapts 8-pin GM LS1 harness to 6- pin GM LS2 throttle body.
They convert the 8-pin GM LS1-style harness to the 6-pin LS2-style throttle body plug.