N-marked tyres are approved by Porsche and specifically developed for their range of vehicles (the N stands for “Nürburgring” where the tyres are tested). Given that your car is only as good as the tyres that are fitted to it, I don't personally see the logic in buying a high-performance SUV and then cutting corners on the quality of the tyres. They are more expensive, yes, but that's because they are designed to improve the handling, braking and wet weather performance of your Macan.