I'm not entirely sure, but I use a 172 Cup as my road rally car, and it has no ABS from factory. They are usually pretty reliable, so long as you don't absolutely hammer the stock gearboxes. In terms of removing airbags, drivers one comes out with the steering wheel, and the passengers one is easy to remove if you take the dashboard top off. I'm pretty sure the speedo doesn't run off the wheel speed sensor, as the cup has no wheel speed sensors, but can't say for sure.
One thing that would make it a lot better is a LSD, as it's fairly easy to spin up the inside wheel, especially in the wet. The car is a weapon for road rallies though, can keep up with anything.