The Bassani and another one, i thinks Pascoe were most common, looked identical but one finished before the shock, the other finished after, the shorter one gave a lot better low end, the longer one with the baffle out made a lot more top too. These results were from trying both pipes on one MIGHTY XL175 in 1975! One of my favourite bikes at the time and referred to in one newspaper test as "a mild mannered girls bike" believe it or not! Bloody idiots, my stocker with just the pipe and some tyres one MX races against the two strokes locally!!!
Cheers,
Kt..............oh and how about some pics, i only have grainy b&w ones of mine!