One of the guys on my local forum is building a Modernized 69 Camaro and I noticed he posted images of mufflers with a butterfly valve that's vacuum controlled.
So I'm wondering if it would be possible/feesable to make a vacuum controlled cutout. You'd need to be able to have a switch to be able to control whether it'll operate or not. AC controls would work.
Something like in this pic but in the piping so there'd be no restrictions at hard throttle. Anybody ever tried?
(I take no credit for the work in this pic.)
