When people talk about supercars, they usually name the obvious stuff first. Ferrari. Lamborghini. McLaren.
A high-mileage BMW sedan that had been sitting around smoking and falling apart usually does not make that list. That, however, was exactly the point of this build.
Danny Z took a rough, abandoned F10-generation BMW M5 and decided to turn it into the kind of four-door monster that can embarrass far more exotic machinery.
And honestly, the car was already halfway there from the factory.
The F10 M5 Was Always A Serious Weapon
This generation M5 changed everything for BMW.
When it arrived, it ditched the old naturally aspirated V10 and replaced it with a 4.4-liter twin-turbo V8, making around 560 horsepower.
A lot of purists hated that at first.
However, the new car was brutally fast, packed with torque, and far more capable of humiliating serious performance cars than many people wanted to admit.
Danny’s car started life as a 2013 M5 with an original sticker price of more than $108,000.
By the time he bought it, though, it had over 165,000 miles and looked like exactly the kind of BMW most people would run away from.
This M5 Came With Plenty Of Baggage
The car was not just old and worn out.
It also came with a pretty wild backstory.
According to Danny, paperwork showed the car had suffered a major engine-related disaster at around 78,000 miles after a dealership mistake led to oil loss and a seized engine. That reportedly resulted in a replacement engine being ordered from Germany.
So while the engine itself was not original to the car anymore, plenty of other parts still had very high mileage.
That included the turbos, and those turbos were clearly done.
Replacing The Turbos Turned Into A Full-Blown Project
The original plan sounded simple enough.
Pull the worn turbos, swap in better ones, and move on.
Naturally, it did not stay that simple.
Once Danny started tearing into the car, he found chewed-up turbo blades, oil in places it definitely should not have been, and a hidden coolant leak caused by a brittle plastic fitting buried in one of the hottest parts of the engine bay.
That discovery alone made the whole job worth it.
It also felt very BMW.
Along the way, he replaced broken plastic pieces with better hardware, swapped the engine mounts, and kept uncovering the kind of stuff that turns an ordinary repair into a full mechanical adventure.
Then, The Build Got Louder
Once the turbo situation was sorted, Danny moved on to the fun part.
A new valved exhaust system completely changed the car’s personality.
That was followed by upgraded intakes designed to let more air in and bring out more of the twin-turbo V8’s sound. The result was exactly what you want from a build like this: more drama, more turbo noise, and a much angrier soundtrack.
At that point, the M5 stopped feeling like an old executive sedan with potential.
It started feeling like something much more ridiculous.
Danny even suggested the setup was now somewhere around the 1,000-horsepower mark, though that kind of number obviously deserves a healthy amount of caution until proven on a dyno.
It’s Still A Sedan — Which Makes It Better
That is really what makes this thing so appealing. Underneath all the chaos, it is still an M5.
It still has four doors. It still has a usable cabin. It still looks, at least to normal people, like some used German luxury sedan.
Now it sounds meaner, pulls harder, and feels much closer to the version of the F10 M5 enthusiasts always wanted.
That is what makes a proper supercar slayer. Not something flashy and exotic.
Something that looks ordinary right up until it destroys your expectations.