Easy to install on the MK4 Focus and very well made. As stated, acceleration is smoother especially in the lower revs and the engine feels more responsive. It must be said that it was installed along with the Mountune High-Flow throttle body elbow, so I'm very pleased about the overall results.
A must have if you’re going to improve the performance of your engine.
Great service, having the plugs come pre-gapped saves lots of hassle. Fitting due to M235/M260 install and a no-brainer to fit these at this cost.