Originally Posted by Airhead Wrangler
That's a South African website. The rest of the world got 40mm bings on r100 models up through '95, but bikes built for the US market stopped getting them in '84. That collector box is only to increase exhaust system volume (volume as in cubic ____s, not noise level) for better running and has no catalytic converter function to it, despite people commonly referring to it as a cat.
Love the fact that US market always receives extra care.