What a few of us KNOW about the Yellowbird is that it launched a hailstorm throughout the Automotive World, even after the 959 was released. In 87, I believe the Top Speed was 211mph, had a 0-60 of 4.0 secs, 0-120 of 11.0. Um, that's haulin'.
Not to mention like the 959 (which IMO is the most advanced auto ever produced for any time period, putting it ahead of the Tucker Torpedo), the RUF had even more innovation. IIRC the CTR's back then had a clutchless Manual trans.