I had a local muffler shop install my new 2.25 piping recently, and since then i put in a home made straight pipe for the CAT. Now that i did that, my muffler sits crooked out the back and rubs against my rear lip and is starting to melt it. IS there a way i can center it or adjust the hangers so that the muffler is straight?

2nd Question, sorry: With no Cat or resonator, my exhaust is real loud, so im thinking of "hollowing out" my cat with a big drill bit and then putting that back on... is there a certain way to do this and is it a good idea?...PROS/CONS. Thanks