We've had quite a few quads here on The Kneeslider, usually several steps out of the ordinary for one reason or another, but I think the Brimstone Quadracycle, a hot rod quad from Brimstone Cycles, takes it to the next level. You still straddle the seat and steer with handlebars, just like any other ATV, but after that, comparisons pretty much stop.
Joe Skonecki, CEO of Brimstone Cycles in Bowling Green, Ohio, figures motorcycle and ATV engines are OK, but, once you have 4 wheels, you might as well go all out. If your tastes are a little different, he'll build you something with an aluminum Dart block with anywhere from 427 to 455 cubic inches and 300 to 750 horsepower, it can even be set up to run propane. A paddle shifter works the GM 700R4 4speed Transmission sending power through a Ford rear end. He uses your choice of carbon fiber, Kevlar, or aluminum for the hood and fenders and when you run through the spec sheet, he'll actually give you your choice of almost anything throughout. Joe does say the optional front wing is mandatory for speeds over 125 mph.
The appearance is sort of hot rod from the cowl forward, with a high performance quad smoothly grafted on to the back. I think the words "hang on" should be stamped into the dash just above the gauges.
Joe points out that every part possible is made in the USA, too, just trying to keep some of the guys over here gainfully employed in the high speed and horsepower business, can't argue with that.
Joe cites performance numbers of 0-60 in 2.8 seconds, 0-120 in 6 seconds while still getting 15 to 30 miles per gallon. I'm not sure about how this is registered on the street but you can set it up with a sound system and mount a hitch for pulling a small boat.
No prices are quoted but, with all of the optional configurations possible, that might be difficult. Not for everyone but a pretty interesting build, for sure.