i put the airforce1 on and now am ready to do some exhaust thing. if i only change the factory muff to a flowmaster 40 -what will i get. i dont want to lose low end. but would like to add a little sound. i dont race around just want it to sound better and maybe be a little less restrictive,

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99' F150 LARIAT S/C WOOD DASH -5.4---3.73'S AIRFORCE 1, AMSOIL, OFFROAD EQUIP GROUP, TOW PACKAGE ,TECH STYLE TONNEAU,

. pic atwww.f150world/las52/