It’s difficult to say what the most popular brand of car accessories is EVER, as that really depends on the type of vehicle you’re looking to enhance. However, we can point you to the most popular car accessory brands on our website. A large number of our best-selling products are from Weathertech, a brand known for its floor liners and mud flaps. Other popular brands include K&N and Magnaflow, which both manufacture innovative and reliable aftermarket exhaust systems.