OEM replacement is about $750. Google GM Part House.
I have one in my garage for an 04 if your interested. Took it out with30k miles. I upgraded to a Pedders close ration rack. I never had long tubes or anythong on it. Worked fine when installed.
I'll take picks if you want. I would sell for $140 shipped if your interested.
2003 Corvette Z06 - MGW shifter, Corsa X pipe, Corsa Xtreme exhaust, Texas Speed long tubes w/o cats, PowerStop rotors/pads, Conti DWS tires, C6Z51 F&R sways, C5R headlights, tuned
04 GTO - sold