I have not had that done on my car, but all the baffles have broken within my muffler, and it sounds decent/bearable. I imagine it'll make the exhaust a fair bit louder, that is if you still have the muffler on, if you don't then you'll be blasting people away. As far as price goes since it's pretty much the same as a catalytic converter job minus the converterit should run you at most about 30 - 50 dollars, mind you for that price it's not really a clean smooth job, just cut off the resonator and weld on a pipe that fits over the two exposed ends. For a really clean job probably about 70-90 dollars. Just a guess though.
///M The most powerful letter in the alphabet