Just to add to the 'it takes all sorts' culture that Morgan Aeros probably encourage, I love the single exit side exhaust system, and really appreciate the way it doesn't shake the earth unless you put your foot down a bit.
I've driven an Aero SS with the twin side exhausts, and enjoyed the extra rumble for a short blast, but found it got a bit tiring. (I'm not yet deaf as far as I know!)
The rear exhausts are great too, and give a more traditional V8 experience. I suppose ultimately all the options are great in different ways, and you pays your money and takes your choice.
On the single exit sides, rolling down the side windows increases the noise a lot, and changes the vocal characteristic in a way that I love for lower speed motoring.
Agree that the rear of the car looks better with diffuser or rear pipes - otherwise looks like something is missing. I may add the diffuser at some point.
Love it!!