DHD 300-125 Duramax Tubular RACE Manifold & Up Pipe Bundle LB7 2001-2004

  
DHD has taken OEM replacement to a new level. This stock replacement up pipe allow 53% greater flow than stock and is a direct bolt-on to your factory manifolds. Unlike factory parts, our up pipe is manufactured from 11 gauge 304 stainless steel and includes DHD's HD 304 stainless steel, internally-sleeved bellow that can take the abuse of high temperature and high pressures. Our up pipe outweighs the competition by nearly a pound and features internal and external flange TIG welds! Inner and Outer TIG welded Steel Flanges (Not cast like competitor). 120-inch wall, 2-inch OD Up-Pipe. Direct bolt-on replacement to passenger side factory exhaust manifold. Significant reduction in exhaust back-pressure. Free-flowing stainless steel inner liner bellows. Stainless Multi-layer Up Pipe Gaskets (1 Upper, 1 Lower). (6) 12PT Coated M10 12.9 Up-Pipe Bolts.