ST225 Spark Plugs.
These are original (O.E.M) ST225 spark plugs. Available as a direct replacement for the Focus ST225 or RS MK2 whether your car is std or modified.
This is a simply modification ideal for increasing performance.
You will notice increased smoothness through the rev range, no spark blow under full boost, and increased performance all round the torque curve.
This price includes all 5 spark plugs….