the power is dependant mostly on the cat, as you mentioned in your post, the active autowerke will handle up to 850whp
Unfortunately, most brands do not reveal which cat they are using, so it's tough to know.
I'm not a fan of this. Autonomous driving is excellent as a safety measure, assisting drivers to regain control and prevent accidents.
However, if the system is doing all the work and you're simply a passive participant, why even have a driver's car like the Supra?
The essence of a Supra is...
Any high-flow intake will work, preferably with a heat shield and an inlet.
MST is an excellent option if you are okay with the wait, as they are almost always out of stock.