A 2019 McLaren 720S brought to Motek EuroWerkz in Plano, TX for a complete dual-purpose street-and-track build: M840T engine upgrades, a three-day dyno calibration session producing 771 wheel horsepower, and a curated 48-pound weight reduction program targeting rotational and unsprung mass. This case study covers every major decision and the reasoning behind it.

If you have spent any time in performance car forums around the Dallas area, you have seen the flash tune vs. dyno tune debate play out hundreds of times. Here is what each approach actually does, and which one your build needs.