What is the best sounding muffler you can put on an aurora, thrush,
dynomax, straight through design, like a glasspack, what should i put
on here?

IT ALL DEPENDS ON HOW MUCH NOISE YOU WANT. GLASSPACK EQUALS WAKE UP THE NEIGHBORS . GO TO YOUR NEAREST MUFFLER SHOP AND ASK IF YOU CAN LISTEN TO A CAR WITH THE KIND OF EXHAUST NOISE YOU WANT , ( DESCRIBE IT , RUMBLE , DEEP THROAT , OR JUST PLAIN OBNOXIOUS. ) DEEP THROAT LIKE A CORVETT IS MY FAVORITE , I HEAR IT BUT THE CITIZENS 50 YARDS AWAY DONT.

okay, so I bought 2 dynomax Thrush Turbo mufflers. They sound bad to
the bone. I was amazed that the inside of the stock muffter was so
small. Like 1 inch or something. the new mufflers are 2 1/2". I'll try to post a sound clip if I get time. They are still really quiet to.