Currently I ONLY have Flowmaster 44 series mufflers on my car as far as exhaust goes ( Yeah, I know it wasnt the best choice), but anyways I want a little bit louder sound.
I was debating on removing the mufflers, or removing the res, but then I said screw that based on what others were saying who had done it.

I am looking into getting a 2.5" or 3" ZZP dp with cat. So my question is about how much louder will it be if I made this addition? And the ZZP dp's are direct bolt on no welding correct?

heres a video of the exhaust as it is now (not the best quality vid)
02' Grand Prix W/ Flowmaster Super 44 Mufflers - YouTube

I would appreciate it, thanks!