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Hummer H3For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine.
Hello a friend on mine have a H3 2006 3.7l with a pipe on the manifold connected to .............. Nothing
I search everywhere and the only thing I found is this picture
Any idea about this factory modification ?
For the moment I close the pipe and no problems
Problem on intake manifold
