You are fully correct.
True dual cost you power not add it some facts are just that facts Proper scavenging of the exhaust makes for the best over all power and Torque. It is easier and cheaper to make true dual rather than a 2-1-2 header that flow correctly
But if you make it loud you will at least think it is fast.

 

Not to mention a big bottom end torque killer. Pipe looks like its a loud exhaust freaks wet dream, all noise with no bottom end. Next thing you'll see is a post on how it runs like a scalded dog.

I've always gotten a kick out of the line, it runs like a scalded dog. Folks equate loud with fast. Just because its making racket doesn't mean its faster.

 

Long as it is loud and looks Bad *** all is is good