I am trying to decide on a replacement exhaust system for my new supercrew 5.4ltr.I don't want any torque loss,don't want it too loud and hopefully more power without any gas milage loss.I was wondering if true dual exhaust with ravin Z55 or flowmaster mufflers would be better than single in dual out ravin or flowmaster? ---------------------------------------- 2001 F150 SUPERCREW 5.4,4X4LARIAT,OXFORD WHITE/GOLD,CAPTAINS CHAIRS,MOONROOF,SLIDING REAR WINDOW,SKID PLATES,CLASS 3 HITCH,BED EXTENDER,LIMITED SLIP ------------------------------------------- MODS - ARE LS2 BED COVER,LINE-X BEDLINER,LUND BUG SHIELD,HUSKY FLOOR LINERS & WESTIN CPS STEP BARS