aFe 49-44001 Mach Force Exhaust System 2001-2004 &gt; Chevrolet &gt; Silverado &gt; 6.6L V8 &gt; (HD) Turbo Diesel (LB7) 2004-2005 &gt; Chevrolet &gt; Silverado &gt; 6.6L V8 &gt; (HD) Turbo Diesel (LLY) 2001-2004 &gt; GMC &gt; Sierra &gt; 6.6L V8 &gt; (HD) Turbo Diesel (LB7)