This 700-Horsepower 1969 Mustang Mach 1 by Ringbrothers Is All Motor

Notorious restomod muscle car creators Ringbrothers had a heck of a time at the 2019 edition of the tuning show, bringing not one but two mouth-watering muscle car builds from 1969.

The 890-horsepower Valkyrja is a bonkers reiteration of a 1969 Chevrolet Camaro and was all well and cool, but the 700-horsepower UNKL probably took the cake even if deep down you're more of a die-hard Chevy fan.

You see, the UNKL is a 1969 Ford Mustang Mach 1, the first one to be modified by the Ringbrothers Wisconsin shop following a plethora of other Mustang builds.

Unlike the supercharged Valkyrja, UNKL is all-motor, powered by a gargantuan 520 cu in (8.5-liters) Jon Kaase Boss engine that pumps out a respectable 700 horsepower and an unspecified, but probably tire-torturing amount of torque.

In an era when just about every custom muscle car build pumps out three and even four-digit horsepower numbers thanks to forced induction, the UNKL is definitely a breath of (naturally aspirated) air.

The old adage ‘there is no replacement for displacement’ seems to have been specifically tailored for this beast of a car, and no supercharger or twin-turbo setup would have made it cooler if you ask us. That 520 cu in V8 is not a big-block but a humongous-block, there's no doubt about it.

A modified Bowler six-speed Tremec gearbox takes care of the power delivery to the rear wheels through a QA1 driveshaft made entirely from carbon fiber. The exhaust sound should raise a lot of back hairs at full throttle thanks to a custom stainless-steel exhaust from Flowmaster.

The car is apparently called “UNKL” because of the special relationship between the Ringbrothers' owner and his uncle, with the uber Mustang paying tribute to the influence that family has had on his passion for cars.

Its interior is old-school racing-inspired, with a combination of carbon fiber, aluminum and gauges for every conceivable temperature and pressure in or around the engine and drivetrain.

The Mach 1's body is made from a mix of carbon-fiber and steel panels that have been manually reshaped by Ringbrothers, giving it a more aggressive stance and adding no less than an inch of width on each side of the beast.

The car sits on Detroit Speed Engineering's Aluma-Frame front suspension system with a cast aluminum cradle, tubular suspension arms, a custom steering rack and adjustable RideTech coilovers specially designed for it. The rear axle is fitted with the Quadralink suspension system also from Detroit Speed, including another pair of RideTech shocks.

With great power comes great responsibility, so stopping power is granted by Baer, with a set of 6S Extreme calipers. The UNKL rides on a custom set of forged HRE wheels shod in Michelin Pilot Sport 4S tires sized 295/35 R19 in the front and a massive 345/30 R20 in the rear.

The only somewhat sad detail about the car is probably the fact that it’s a one-off, but you can be rest assured its value increases thanks to it. We can’t wait for SEMA 2021 and see if the Ringbrothers will manage to outdo themselves with another big-block Mustang, but so far this looks like a magnum opus in their N/A custom builds segment.