  Oxygen Sensor Housings
The oxygen sensor housing is a cast iron piece that sits between the turbocharger and the downpipe. In addition to its role as a holder for the oxygen sensor, the O2 sensor housing joins exhaust from the wastegate port with the exhaust from the turbine outlet port. Replacing this piece with a better, more free-flowing unit can yield benefit in horsepower as well as the prevention of "boost creep" when using larger turbos and free-flowing exhaust systems.
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