What I will say however is that it was a revealing exercise into the dodgy world of Asian scooter restorations. The exhaust itself came off quite easily but the bolt securing the exhaust to the frame was very difficult to remove. The restorers obviously did not have the correct size bolts to hand and so used a roofing bolt that was overlength and a little too thin. To make it fit they'd used about six washers of different sizes with bolts in front and behind the connection to keep it tight. They'd obviously installed the exhaust before the engine and swing arm were in the frame as they'd threaded it from front to back. This meant I couldn't extract without removing the whole engine as the bolt was butted up against the frame. Instead I chose the dodgy mechanic's method and just cut the through the bolt.
The Sito exhaust slipped on easily but I suddenly found that it was missing the securing bolt. This led to two trips to the hardware shop for new bolts as I made the mistake of assuming the new securing bolt would need to be approximately the same size as the old one. That was a wrong assumption as it turned it. The end result though is that the new securing bolt is much thicker and sturdier than the old one.
So, did it work? The first thing you notice is the Sito gives off a deeper tone than the tinny old exhaust. It did not really improve take off speed but as I worked up through the gears I found the old girl was able push on through past the 40, 50 and finally 60 kph barriers much easier than ever before. For a few minutes the needle even waivered towards an unheard of 70 kph so from my perspective this has been a very significant improvement.