ECU Flash rev limiter etc

[Randy B]

The legality of ECU flashing is quite clear in the United States: it is up to local municipality or state governments to set standards that govern environmental matters and enforce them. It is permissible in most states to flash an ECU provided that the “flashed” motorcycle can pass whatever emission standards that have been set for that State.  Some States test yearly while others do not.

I'm not so sure that this is the case anymore. With the passage of HR1 (the one big beautiful bill), it removes individual states authority to regulate emissions by setting their own standards.
Basically C.A.R.B. has been neutered. The EPA is charged with enforcing the clean air act, but I'm unsure how this is going to play out moving forward.
Lee Zeldin has stated and testified that he will be making changes to, or eliminating completely, many existing regulations. As of right now, we don't know what his specific plans are. All we can do at this point is sit back and play "wait and see".