Tried a Muffler delete pipe on my NB it was so freaking loud and resonated so badly I only had it on the car for a few days.
Go buy it an aftermarket muffler. DIY install on an NB. Undo a couple of bolts undo some rubber hangers reverse for install and badda bing badda bomb more gooder noises.
Got a Borla on the NB for quite a while really like it loud when it needs to be and you can have a conversation in the car while rolling down the freeway.