For reference, the original Dunstalls were slim and seamless, nicely engineered and finished. I still have a brochure from the time with an XS2 in it with his 2-1-2 system on it. The XS2 works fantastically well on these pipes if you up the main jets to 150s, that`s all we did. 40 years later it still looks and sounds fabulous. I`m doing one for myself with an R1 front end, 320mm radial brakes, spoked wheels, 840 motor, box section rear end on Ohlins and those pipes - should be the ultimate XS I reckon