2000-2004 Toyota Tundra, 2001-2003 Sequoia, 2WD & 4WD: 4.7L V8, Tube Size 1.5" O.D., Collector Size 2.5" O.D., Collector Length 6". FLOWTECH's shorty headers are just the ticket for those who want the best of both worlds - top performance and excellent value. All our Shorty Headers install easily to the factory exhaust system, and offer maximum horsepower gains plus increased efficiency!. Breaking in an engine with ceramic coated headers WILL result in damage to the coating and will VOID all warranties. Ceramic coated headers require several heat cycles to fully cure before they will withstand extreme heat. Flowtech recommends using cast iron exhaust manifolds or old headers to break in new engines to avoid coating damage. Please call Flowtech tech services at [phone removed by eBay] for additional.