Man Used AI to Generate a Custom Tune for His BMW 335i originally appeared on Autoblog.
TikTok creator wyattwebsterrr might have just pulled off one of the wildest DIY tuning experiments yet. He recently bought a 2007 BMW 335i for $1,500. Of course, for that price, it wasn't perfect. It sat on 240,000 miles and needed a new transmission, which he paid just $200 for. Other than a straight-pipe exhaust, the BMW was completely stock. Then, he asked ChatGPT to write a custom tune. The result is a beater that would outrun a brand-new BMW 3 Series.
Feeding AI The Info
Wyatt started with a simple question for ChatGPT: “Can you give me a custom tune for my 335i?” He then supplied the AI with details such as his ECU version, the fact that it has a 6-speed automatic transmission, and the type of turbos it was equipped with. In return, ChatGPT handed over a full custom tune file. Wyatt then used the MHD Tuning app to load the AI’s creation straight onto the E90's ECU. Usually, this process would take hours, if not days, when working with a reputable tuner. But thanks to modern technology, it took just a few minutes.
The Surprising Results
People love modifying 335i models because of the N54 engine that lives under the hood. From the factory, the twin-turbo 3.0-liter straight-six sends 300 hp and 300 lb-ft of torque to the rear wheels. Although Wyatt has yet to release all the power figures, he posted a TikTok showing the tuned 335i's new driving experience. Boost pressure jumped to 19.3 psi. The exhaust, once relatively tame, now delivered loud burbles and pops that were impossible to ignore. The rear tyres broke traction much easier than before, and the BMW's 0 to 60 mph time dropped to just 5.17 seconds. That's a full second quicker than before, thanks to a tune written entirely by an AI.
Cool Tech or Risky Business?
Professional tuners spend years learning how to safely squeeze more performance out of an engine, while accounting for wear and tear and long-term reliability. While ChatGPT might be able to make a high-mileage BMW faster, there's always the risk of something breaking. Still, for a cheap 335i and a viral TikTok clip, it is hard to argue that this wasn’t worth the gamble.
Man Used AI to Generate a Custom Tune for His BMW 335i first appeared on Autoblog on Aug 16, 2025
This story was originally reported by Autoblog on Aug 16, 2025, where it first appeared.
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