accufitgolf In the case of this Integra head, the illegal part comes in with the 480cc. size.
But I can see your point as to claims about the 'hot'. If it's not been tested/rejected by the USGA, then any company can put out any head with that claim. Even if it is not over the max COR, how would we ever know without having a head tested ourselves. Maybe that's where the 'illegal' part comes in.....making/advertising false claims.π
Most users have said they see no added distance on some of those purported 'illegal' heads, so maybe if a class action lawsuit was filed against a company or 2, after having a couple heads tested, it would stop that kind of shit! And maybe put some of those assholes out of business!