Shoehorning A 707 HP Hellcat V8 In A 1999 Mazda Miata? Hell Yeah!

If you own a car that’s underpowered and want a little more grunt, you can either upgrade your existing powertrain or instead, take out your car’s engine and swap it for something more powerful.

Both methods work but there’s something especially appealing about fitting an engine into a car that was never meant to support it. Like putting a huge Hellcat V8 in a Mazda Miata, for example.

This may sound like something you’d only expect from the world of Hot Wheels or a cartoon, but it’s very real and the build is currently under way in the United States. The finished product is bound to be absolutely phenomenal.

The group of friends responsible for this most epic of engine swaps acquired a wrecked 2017 Dodge Challenger Hellcat and quickly took out its almighty 707 hp 6.2-liter supercharged V8 and Tremec TR-6060 six-speed manual transmission. They could have decided to fit this engine into virtually anything and ultimately chose perhaps the most unlikely candidate imaginable: a 1999 Mazda Miata.

Not that much of a hassle as you’d imagine

When new, the tiny NB-generation Miata was fitted with a small 1.8-liter engine pumping out 140 hp. Much to our surprise, the engine bay of the Miata can actually accommodate Dodge’s Hellcat engine. They had to widen the transmission tunnel to fit the powertrain, but other than that, sliding the V8 in wasn’t too hard.

Of course, this Miata won’t hit the streets with simply a Hellcat engine and transmission and the rest of its factory parts intact because that would be… inconvenient. One example is the rear differential, which will be replaced with a Ford 8.8 that can handle the power and torque instead of exploding at the first nudge of the gas pedal.

The build is ongoing, but you can watch the first four parts in the playlist below. And you can bet we’ll be keeping a close eye for the final parts of this crazy build.


  • Mr. EP9

    I’m honestly surprised I haven’t seen someone put one in a Chrysler 300 or a Ram 1500 yet. Those seemed like the obvious choices.

  • Bash

    Wow, the engine itself weights as much as -I don’t know- half the car maybe. I know I’m exaggerating.
    seriously though, that is defies the purpose, they could install a jet engine in the back,

    • TheHake

      Tons of power NEVER defies the purpose. NEVER! EVER!!!

  • Ilbirs

    The MX-5 is what would be a Lotus Seven if it was designed on the last 30 years. I’m impressed about what they do with this model. Considering that the current generation has its Fiat 124 Spider twin, I imagine what would be if FCA wanted to put something more powerful than the 1.4 T-Jet. It’d be a modern day Cobra.

  • Callanish

    Wouldn’t this thing need 4wd to even have a remote chance in hell of controlling all that power.

    • Bo Hanan

      Seems the first test run would split the car in half leaving the A-pillar back sitting at the starting line.

  • nastinupe

    I would love to see that engine go into something like a 997 Porsche 911 4S. Remove to rear seats to make room. That would be fun. A 707 HP Porsche with AWD.

  • SteersUright

    If you’re going to spend so much time and money, why not plug the massive V8 into the newer and far better looking Miata rather than that ratty looking older one? Also, doesnt this engine way basically as much as an entire Miata on its own?

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