Flowmaster Selection

Hey guy's,

I have a 1970 Dart with a stock 360 and was looking for an exhaust to put on it. I want it to sound bad but not 1,000 mph when im going 20 mph. I kinda want to wake up the neighbors being that im a kid and loud cars are my thing. I heard the 40s are ok but the interior sound is deafining. What do you guys think?