This is the F355 engine configuration from 1996 to 1999. The 2 air intake ducts join into one single air-flow meter and then split again to feed the headers. In pre-1996 engines the 2 air intake pipes are seperated from the 2 air filter box and so have 2 seperate airflow meter.
The pre 1996 engines have slightly better power output ( and they were still used on the F355 Challenge cars past 1996) but obviously need 2 airflow meters to adjust rather than the "convenient" 1 unit.
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