There are 4 advantages to BMW E30 accessories that a driver would want. Aftermarket power-adders like long-tube headers, high-flow air filters, and performance exhaust systems boost horsepower and torque for a more engaging driving experience. Sports suspensions and coil-over kits enhance handling with improved stability, as well as cornering ensuring a safer drive on the road. Also, the aesthetic accessories such as custom rims and body kits add to the E30's appeal in terms of attracting attention on the street. The marginal benefits are some performance upgrades boosting fuel efficiency and some added comfort with aftermarket seats and interior enhancements. It's not just that these accessories make the car look and perform better, also they add to a sense of having customized the vehicle to your specific needs.