Interesting question

I think the shroud came out with VC, (How do you make an old straight six sound like somethimg different - increase the fan noise, and make it whoosh smoothly? ) It's just my observation of course on that idea. But I love it, might try it on the Kingy.

In terms of serious after-market use though, if going that far, then why not go electric? You could still use the shroud of course.