From a C body owner's perspective,the TTi's for your Fury are worth every penny.Go with the Dynomax mufflers included in the kit.
I installed my system in 2006 with no hassles.
No rattles or clunks.
Just a nice deep tone and no resonating inside the car.
I went with the 2-1/2" system which was plenty for my warmed over 440.
The 3" system will be louder and will have a tighter fit.