zoodad mod is where you open up the air intake behind the drivers side of the grill.just use a hole saw or some thing simular to open it up.well i don't know if it really helps maybe 25* cooler exhaust temps if that. but the mod is free and anything to help lower exhaust temps and help with a cooler intake charge.
2003 CRW CAB LB 4X4 6SPD,AFE STAGE 2,38r,DP TUNER,4'' MBRP,FASS 15,Farmers Disel Performance 160/100 injectors,ITPREG.RETURN,TERMINATOR
2001 crw cab short bed auto 4x4 5"exhaust afe stg 2,f6,jw trans,terminator,cass. stg2's,itp reg return,fuel lab pump.