I have a few device(s) installed on my 2017 Turbo Lexus. Yes they improve performance. Newer drive by wire throttle controls are laggy as crap. 30 year old cars with cable driven throttles perform better than new electronics in some cases.

I've got an aftermarket OEM Toyota (Tom's) device sitting between my boost sensor and cam sensor to advance the timing and boost and I've got a throttle advance controller to get rid of the throttle delay in the drive by wire throttle.

And the car isn't fun to drive without those two things. I would just drive something older without all the throttle delay between pushing the accelerator and the car "going"

Yes we have a salvage model 3 Tesla - I'm saving the planet or something. I also have 5 other cars I like to tinker with on the weekends. This will keep happening most likely due to the RPM Act.

If you're not an OEM certifying the car, the EPA is going to keep going after aftermarket tuners; too much evidence to ignore.