K4120A – FOR 2004 & 2006 – CHEVY/GMC 6.6L LLY DURAMAX DIESEL 2500/3500 (ALL CAB AND BED LENGTHS) – 4″ ALUMINIZED – PERFORMANCE DIESEL EXHAUST KIT – CATALYTIC CONVERTER BACK SINGLE WITH TURBO DIRECT PIPE #321056 INCLUDED IN KIT 

C.A.R.B. EXEMPT VIA EXECUTIVE ORDER #D-778