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Porsche 911The Porsche 911 (and all it's trimlines) is a famous, distinctive and durable car has undergone continuous development since its arrival in 1964. The 911 was developed as a more powerful, larger, more comfortable replacement for the Porsche 356.
Cylinders 1-3 (drivers side) are bank 1, and cylinders 4-6 (passenger side) are bank 2. Then on each bank, you have a pre cat sensor, and a post cat sensor.