For my Cuda, I bought my exhaust components from Accurate Exhaust Products LTD and it uses both a "Muffler" and a Resonator that look stock. Both are pretty much straight through and there is a low rumble for sure in the interior but the tone at idle and driving is very nice. I would make a recording of it, but I am not sure it would capture the sound very good. Inside the car, you can talk to a passenger at cruise but you do have to speak up a little bit.

Here is a photo of the two components together and with the E-Body I would not worry about bumps at all. The exhaust hangers in an E-Body keep the exhaust locked in pretty tight.

I also have a photo of the inside of the muffler if you are interested as it shows the very slight bend!