Hydraulic Roller Install Passenger Side Headers
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Seen here is the passenger side header with the aforementioned 3-bolt flange bolted up to the Precision Turbo (58mm). Also noticeable is the stock location O2 bung with the O2 sensor installed right below the 3-bolt flange. For dyno testing we plugged into this bung for precise AFR (air/fuel ratio) mixture readings from the dyno's wide-band gauge. Tailpipe readings tend to be lean (0.3 to 0.5) after going through the turbo and exhaust system. View Related Article
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