The downpipe is a pipe that bolts to the back of the turbine housing of a turbocharger and begins the exit of the exhaust gas out of the car. When you look for down pipes you will typically run into 4 kinds. 1. Blank plate: Identical to stock construction with the wastegate portion completely covered. 2. Bellmouth: Completely open design. 3. Split bellmouth: Similar to bellmouth only with a divider inserted to separate the wastegate. 4. Divorced or Twin Dump: Separate exhaust and wastegate piping that connect further downstream.
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