So my muffler got damage and bent in and I was thinking about replacing it with an aftermarket one or just to have it be a straight pipe back since it is connected with a flange. Any suggests on which muffler I should get that would sound good?

 

Can't help you with this, but subscribing for a straight piped rdx. There is one on youtube I think.

 

OP, you might get more response in another sub-forum like problems and fixes or diy.