The sports exhaust system of the new 911 GT3 has two front silencers, two catalytic converters and one rear silencer, which discharges into the central twin-tract tailpipes. The large volume of the exhaust system reduces exhaust backpressure and thus increases power output.
The two Lambda sensors of the stereo Lambda control circuitry regulate the composition of the exhaust gas separately in each exhaust tract, while another pair monitors pollutant conversion in the respective catalytic converters.
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