I can't comment on the "Modern Classic" but my 85 has a Stainless sports system
A a nice 4 into 1 manifold.
No Cat
Single silencer /semi sports (no tail box)
WORKS FOR ME.
I can only link you to a you tube clip of mine
( before I bought it & with its last owner)
The Semi sports sound is pleasant and does not annoy your ears on a long run.
I've had my days of full sports sounding pipes on Japanese motorcycles.
I prefer something less intrusive these days
(It's an age thing ! )
https://www.youtube.com/watch?v=e0C_jGB8idc&feature=youtu.be
or
https://www.youtube.com/watch?v=Po9wY7yRku8


Magwa

1950 Allis Chalmers B tractor
2000 Porsche boxster
2014 Skoda yeti 4x4 elegans