Hi guys, I'm new here and I don't even have a Sea Ray... Yet! But I'm looking to buy a 2003/2004 280, and have some questions: The ac unit, does it work as a heater aswell? What is the top speed and cruising speed of a single 496 compared to twin 4,3's? Where can I get what I think is called a "letter of conformity" for the engine(s) that states that the engine(s) comply to emission regulations? The generator, is it noisy to the point of irritation, or is it pretty quiet? Fred.