flowmaster 40 series tone change

i know its not a mopar but my father had flowmaster 40 series on his 327 1986 chevy truck. it was a dual exhaust system with headers and no cats. they sounded like ***. he just put an x pipe on today and got different mufflers. he decided once he was done with the x pipe he would slip the flowmasters on just to see if they sounded any better you know just for ***** n giggles and with the x pipe they sounded like completely different mufflers!!! they actualy sounded good! i cant even belive what a difference the x pipe made with those mufflers!! so basicaly the moral of the story is get a x pipe if youve got 40 series :toothy7: also has anyone tried them with a H pipe?

since my darts exhaust is hanging there with no mufflers i threw the two flowmasters on it. it has an H pipe. sounds decent but honestly i like the glasspacks i got for $7.50 each better.