will duel mufflers fit?

ive got a 1998 ford f150 reg. cab step side. i want to put duel exhaust on it but i want two mufflers instead of the one into two. what my question is will two mufflers fit? would you have to stand them up side by side to make them fit and if so is that good for them? im thinking of useing flowmaster.
thanks

Should work, and should not hurt anything. Should only improve manyh things.