Gibson 1-1/2in 16-Gauge Perf Header, Ceramic Coated | Cadillac Escalade Base 5.3L (02-05) (GP129S-C)

The Gibson GP129S-C Performance Header is a ceramic-coated exhaust header designed to improve engine breathing and deliver more usable horsepower and torque at low- and mid-range RPMs, including highway speeds. Its dyno-tuned design also supports cooler operating temperatures. The header features 1-1/2-inch tubing, 16-gauge construction, and heavy-duty 3/8-inch laser-cut port flanges engineered to resist warping and leaks. OEM-style connections allow it to work with the stock crossover pipe, while premium gaskets and hardware are included. Gibson backs the header with a lifetime limited warranty and states that installation will not affect the factory warranty.

This header is listed for 2002–2005 Cadillac Escalade Base models equipped with the 5.3L engine. It is designed as a direct replacement for the factory manifolds and uses the stock crossover pipe; no welding is required. The application is suited to both lowered and raised vehicles and for street or off-road use. Gibson states that the header is 50-state street legal and meets EPA and CARB requirements. Confirm vehicle configuration and fitment before installation, as no additional chassis or compatibility details are provided. The included premium gaskets and hardware support installation using the header’s OEM-style connections.