Ditch that restrictive air box for an air filter that is the size of the air box. I’m not very impressed by K&N and other reusable filters.

Duralite B105006 open body 4″ air filter.

Other BHAF Part numbers:
FleetGuard AH19037
NAPA 2790
WIX 42790
Donaldson B105006
Baldwin PA2820
Hastings AF1012