1986 951 exhaust

[challenger 951]

Hi everyone, Does anyone have an opinion on BB vs Fabspeed? I called BB and their system is 2.5", not sure about the fabspeed system size.. The car is for the street, stock right now, but eventually going to upgrade components slightly over time. Existing system too quiet, I don't want drone, but do want a nice sound with increased performance. I am thinking to only replace the catback as the rear muffler pipe is rusted through and was threatening to fall off the car. If anyone has some used parts, i am ok with used stuff from a reputable seller and could than maybe afford a turbo back system ....... all opinions welcomed and encouraged .... thanks david