It does not go by year, rather the vehicle itself and how it was optioned from the factory. 98-02 LS1 cars can come with either. The 93-97 cars I believe are just 3 channel, don't quote me on that though.
2010 Camaro RS/SS (rotofab, headers & catback)
2007 TBSS (TVS 2300)
2006 Silverado CCSB (TVS 1900)