The guiding principle in the design of the SF90 XX Stradale's interior was to highlight the cockpit's racing vocation through targeted actions that would make significant weight-savings. The main areas involved were the door panels, tunnel and mats, which are now simpler in terms of their shape and the materials used thanks to an emphasis on technical fabrics, while carbon-fibre was used for functional areas. In addition, carbon fiber racing seats were specially designed to enhance sporty driving pleasure, without compromising comfort.

Styling-wise, the SF90 XX Stradale incorporates the engineering principles that underpinned the SF90 Stradale and pushes them to new levels, so that there is no doubt that this is an XX car. One of the most distinctive characteristics of the SF90 XX Stradale's design is its rear wing giving it the long tail silhouette typical of racing cars with the advantage of improved aero and cooling. The SF90 XX Stradale's styling cues are designed to highlight its thoroughbred performance characteristics whilst still retaining the pure lines and forms of its predecessor.

The SF90 XX Stradale has inherited the SF90 Stradale’s signature PHEV layout, in which the V8 internal combustion engine is integrated with three electric motors, two independent on the front axle and one located between the engine and gearbox at the rear. This configuration has been further refined for the SF90 XX Stradale by increasing the compression ratio and removing the secondary air system which allows the car to unleash a maximum of 1030 CV, (+30cv more than the SF 90 Stradale) setting a whole new Ferrari performance benchmark.