The EPA 2027 regulations are already easier on high-end powertrains because the emission limits scale with power (mg/hp-hr). A 1000hp car gets 10x the emissions allowance of a 100hp car. This is to make it easier for pickup trucks to pass new emissions and performance cars benefit from it as a nice side effect. I think this is also why Toyota doesn't seem rushed to updating the V35, as the vast majority of the products using it are sold in US or other markets with much easier emission laws.
By comparison Euro emissions intend to encourage people to buy tiny supermini cars so their emission limits are fixed for any passenger vehicle. In most parts of the world pickup trucks are strictly commercial use so they use different regulations. The EPA rules were made like that because pickup trucks are mostly used as passenger vehicles in US.
