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(A) A set of beat-up Hooker headers were rewelded to face the front so exhaust pressure can spin the turbine, and an O2 (oxygen) sensor mounted to the exhaust outlet is for an air/fuel gauge mounted in the car. The Tial wastegate is the bypass seen at the lower left of this image (B), which will open to allow excess exhaust pressure to bypass the turbine. The pipe above is the carb inlet. Note the stainless lines carrying engine oil to the turbos.