Autotechnik + Tuning (ATT) has released a new tuning package for the BMW M3. Dubbed the Thunderstorm M3, the model receives a inbuilt compressor with engine software optimization that greatly increases engine performance. Performance specs weren’t released but the upgrade gets you 500 horses. ATT will upgrade the engine for a total of 11,749 euros. Performance is further enhanced by an upgraded chassis with KW coilover suspension for an extra 2,029 Euros. If that’s not enough, ATT is also offering an interior package with either carbon parts or Swarovski crystals.
More images after the jump. (via egmCarTech)