is there any gain running 3" from headers thru x pipe to 2.5" muffs and then out 2.5" pipes vs running the 2.5" the whole way from the headers?

I have the 2.5 dynamax aar style muffs (inlet/outlet both sides) and the 2.5" aar trumpets.

they dont make the muffs or the trumpetyailpipes in 3"