Strakes and fins
Take a little 1960s tail design, add some 1980's aerodynamics testing, cut some airflow blockage from the supporting metal for the tail rotor- performance improvement by reducing tail rotor thrust requirement. Might not be a full 1000 pounds, but is definatly a good amount. It seems to give better payoff at higher DA, were the engine is the limiter and not the transmission.
When I worked at MDHI we made some pretty good gains with small bits of metal and a few inches of somposite tube. The claims do not surprise me at all.