Header, Chevrolet Colorado 4-cylinder, Shorty Style (see 5-cylinder Colorado headers)
4-Cylinder Colorado Header. This is a shorty style header that bolts on to 2004 through 2006 models with no modifications, except the requirement to extend the wiring to the oxygen sensor. Not emissions legal. Fits 2wd and 4wd. Uses stock gasket, and hardware.
The original metal exhaust manifold gasket can be used.
The seal (GM part # 15105884) between the headpipe and exhaust manifold can also be reused, if care is taken to remove it from the stock exhaust manifold.
On 2007 and newer models, an extra bung for the oxygen sensor is required to be installed behind the second catalytic converter. At this time, we don't know if this will prevent the check engine light from coming on.