'03-'07 Ford Super Duty Powerstroke 6.0L Diesel F250 F350, 4" Aluminized Cat Back Dual Steel: Aluminized Size: 4" Short Description: KIT, 4", CBDL; AL: FRD Long Description: KIT, 4", CAT-BACK, DUAL; ALUMINIZED: 2003-2007 FORD 6.0L POWERSTROKE F250/F350 Comments/Disclaimers: N/A