The Brooklands exhausts differ between cars and motorbikes, although the idea is much the same, a staggered entry/exit silencer and a fishtail end. The thing is, what should go on a Three Wheeler? The big argument, is it a car or is it a motorbike should determine which one
All the Brooklands exhausts I've seen have the fishtail tapering in plan to a narrow exit with perforations in the side; the Morgan one looks rather clunky. It would be nicer if the tail pipe curved in to follow the shape of the body.
