Overview:FLOWTECH's emissions-friendly headers are just the ticket for those who want the best of both worlds - top performance and a clean machine. All Shorty Smog Headers bolt on quickly and easily to the factory exhaust system, retaining all stock emissions equipment, and offering maximum horsepower gains plus increased efficiency! This is a 50-State Legal header C.A.R.B. EO #D-115-16.Features: This is a 50-State Legal header C.A.R.B. EO #D-115-16. Sturdy 16 gauge tubing Extra thick 3/8” flanges for a leak-free seal Designed as a direct fit replacement for OEM exhaust manifolds Will accommodate all emission control devices Bolts directly to factory head pipe Complete with premium gaskets and hardware Application: 1998-2000 Chevrolet Tahoe 1998-2000 GMC K2500 1998-2000 GMC Yukon 1999-2000 Cadillac Escalade 1998-1999 Chevrolet C1500 1998-1999 Chevrolet C2500 1998-1999 Chevrolet C3500 1998-1999 Chevrolet K1500 1998-1999 Chevrolet K2500 1998-1999 Chevrolet K3500 1998-1999 GMC C1500 1998-1999 GMC C2500 1998-1999 GMC C3500 1998-1999 GMC K1500 1998-1999 GMC K3500 Specs: Brand Flowtech C.A.R.B. EO # D-115-16 CARB (California) Compliant Yes CARB EO# D-115-16 Collector Diameter 2.50 inch Emission Code 1 Engine Chevrolet Small Block Header Finish Black Paint Header Style Shorty Primary Tube Dia. 1-5/8 inch Product Type Headers Tube Material Mild Steel Warning California Proposition 65