Well, this is a bit disappointing...
"Our second cars worked perfectly fine, but Ford admits that the RS's Twinster system is pretty close to its limits handling 350 horses and 350 foot pounds already, so in case you're planning to go aftermarket and increase the power further without beefing up the drivetrain, expect to get some shredded metal with your voided warranty."
Consider that since this system exists on a whole 2 cars, it probably won't be cheap to fix.
I wonder why they didn't go with JTEKT?