Aftermarket modifications are a popular way for car enthusiasts to personalize and enhance their vehicles. These modifications can range from performance upgrades, such as turbochargers and exhaust systems, to aesthetic changes like custom paint jobs and body kits. While aftermarket modifications can significantly improve a vehicle’s performance and appearance, they also raise important considerations regarding car specifications and regulatory compliance. In this article, we will explore how aftermarket modifications impact car specifications, focusing on performance enhancements and compliance with regulatory standards, with a special emphasis on BMW specs.