Used as upgrade to my standard (and worn ST plugs). Easy DIY upgrade, just leave yourself a couple of hours for the first attempt. Car feels more responsive and smoother. Great price for the genuine Ford item and good service from Team Torquesteer.
I was having problems with a misfire on my 2006 Focus ST and despite the Ford folk trying to fix it (without success), I opted to do the job myself. I fiited 5 new RS plugs gapped down to 0.6mm, as I am running a higher than standard boost. Easy enough to fit for an amateur mechanic and car drives like a dream now.
They definity improved the ST's preformance. Very good price local dealer want to charge me €100 ! And top marks to the team for how quick you got them to me (3 day) and i'm in Ireland !
This is my first order from Team Torquesteer and certainly wont be my last. The price was by far the cheapest available and i even got a little bit more knocked of as im a member of the Focus ST owners club. Highly recommended product, highly recommended company.