3" or 2.5" Exhaust ?

i run 3" pipes and dynomax super turbo mufflers on my dart.. i love it.. not loud at all. now i have the exhause incase i ever want to really get crazy with the motor.. if its close to the same price go 3". when i went from a 2 1/2 system with a flowmaster knock off muffler to the 3" X-pipe dynomay system i had to go up 2 jet sizes in the primaries. thats how much of a difference it made.. the car really seemed to like the 3" set up and i'm not putting out tons of power.