To achieve better performance and great sound, aftermarket exhaust kits are some of the most popular upgrades for Focus ST owners. Check out our guide to start your search for the best one for your ride.

Do you have any aftermarket mods on your car? If so, ECU tuning can help you get the most out of your engine. ECU tuning lets you adjust important settings such as the air-fuel ratio and ignition timing to improve performance.

Engine knock is a well-known issue that can spell the death of your engine in severe cases. Learn about what causes engine knock and how to fix it.