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111 Enlarge the opening in the air filter housing to 2-13/16”. The gaskets typically are already this size, but final trimming This modification has not yet been tried, so performance improvements are unquantified. In theory, this mod can R1/2" 3/8" 1/2" REMOVE MAT'L AS SHOWN GASKET AIR FILTER HOUSING BUTTERFLY HOUSING
Figure 8 - Butterfly Housing Airflow Improvement |