2 K & N 33-2138 Air Filters 2003 FORD F550 SUPER DUTY 7.3L V8 DSL - All 2003 FORD F450 SUPER DUTY 7.3L V8 DSL - All 2003 FORD F350 SUPER DUTY 7.3L V8 DSL - All 2003 FORD F250 SUPER DUTY 7.3L V8 DSL - All 2003 FORD EXCURSION 7.3L V8 DSL - All 2002 FORD F550 SUPER DUTY 7.3L V8 DSL - All 2002 FORD F450 SUPER DUTY 7.3L V8 DSL - All 2002 FORD F350 SUPER DUTY 7.3L V8 DSL - All 2002 FORD F250 SUPER DUTY 7.3L V8 DSL - All 2002 FORD EXCURSION 7.3L V8 DSL - All 2001 FORD F550 SUPER DUTY 7.3L V8 DSL - All 2001 FORD F450 SUPER DUTY 7.3L V8 DSL - All 2001 FORD F350 SUPER DUTY 7.3L V8 DSL - All 2001 FORD F250 SUPER DUTY 7.3L V8 DSL - All 2001 FORD EXCURSION 7.3L V8 DSL - All 2000 FORD F550 SUPER DUTY 7.3L V8 DSL - All 2000 FORD F450 SUPER DUTY 7.3L V8 DSL - All 2000 FORD F350 SUPER DUTY 7.3L V8 DSL - All 2000 FORD F250 SUPER DUTY 7.3L V8 DSL - All 2000 FORD EXCURSION 7.3L V8 DSL - All 1999 FORD F550 SUPER DUTY 7.3L V8 DSL - from 12/98 1999 FORD F450 SUPER DUTY 7.3L V8 DSL - from 12/98 1999 FORD F350 SUPER DUTY 7.3L V8 DSL - from 12/98 1999 FORD F250 SUPER DUTY 7.3L V8 DSL - from 12/98