Speaking of high-HP aircraft engines, I've never looked at what powers them, but the larger med-evac helicopters that come over our house seem to be packing some serious power. I lived previously just up the road from a place that retrofitted Chinook helicopters for heavy-lift applications (eg. bridge building), and even those monsters didn't seem to shake the house as bad as these newer med-evac machines, although that might have as much to do with how hard they're leaning on the throttle, as anything else.
There's a park adjacent to my house, which happens to be one of the local med-evac sites, meaning that's where they cart the patient by ambulance, for helicopter pickup when there's an accident on any nearby road. Only happens maybe once per month, but those helicopters come in low and fast when it does, and take off under full throttle, heading off to the bigger Philly or Lehigh Valley trauma centers.