well since bigger is better, and you want bigger, I would look on craigslist for used diesel leaf vac. with a 15" intake hose diesel is the way to go if you want big and badass. http://hudsonvalley.craigslist.org/grd/4058871089.html there's an 80hp john deere diesel giant vac. you want bigger there it is. you ready for that kinda sucking power. hide all small animals and objects that you want to keep because this will destroy anything that gets sucked in...a 16" inlet will take a **** ton of leaves, probably never clog.