With a car like the 720S, I’d focus on the quality of the calibration and the condition of the car rather than chasing maximum output. The model year, existing ECU software, maintenance history, and any previous modifications can all affect what makes sense. While looking into McLaren chip tuning, I came across this page: https://deiz-garage.ae/chip-tuning/mclaren/ . It’s a relevant starting point for learning about the service and preparing questions for the workshop. I’d ask how the car is diagnosed beforehand, what changes are proposed, and how the results are verified afterwards. It’s also sensible to discuss fuel requirements, warranty implications, emissions rules, and long-term engine reliability before agreeing to anything. On a car this sophisticated, I’d rather have a transparent explanation than a promise of extra horsepower.