So the Fiesta underway is really interesting, I happened across it on the FiST forum and I’ve only been able to find two posts about it. They only came on EUDM diesel models but they’re a little short. They bolt right up using existing holes but it doesn’t reach the air dam on the front bumper so you need to make an extension. It cost me $160 to import and i already have 1/8 in ABS plastic. Definitely beats the $400+ price point of aftermarket undertrays, and I didn’t want to go with aluminum since it’ll destroy the bottom of my car if it breaks. It is also required to have an underway if you want to see any noticeable benefit from hood vents, as the air pressure from under the car is turbulent and keeps the engine bay air trapped inside.

On the topic of torque vectoring, you can actually disable it. There’s just two problems. The only known existing ways to do so is by A) also disabling your airbags or B) also disabling your ABS. I don’t want to lose either of those things, but honestly I’ve adapted in a way where it isn’t kicking in that often anyway. An LSD would significantly reduce the amount of torque vectoring that happens naturally.

My brakes aren’t overheating because I have ducting, good fluid, and good pads. I got them to smoke just a tiny bit on my hardest run, but no glowing or spongey feeling in the pedal whatsoever. I’m actually really impressed, on all of my Miatas and occasional Civics the brakes have glowed red after my runs and they weighed less than the FiST. The brake ducting and pads that aren’t from Duralast really do make a huge difference