for the spacers: there's a couple of companies that do them IIRC. One does 2 types of spacers: one where you can re-use the strut bar, and a taller one where you won't.
With regards to the aftermarket plenums (which I would recommend instead of the spacer) the V+ from Kinetix will allow you to use the strut bar, and I think it's the only one which will allow you to do it.
As per my UTEC comment, it means that:
once you are finished with modding, in NA version, then it's time to do something about the ECU (at this time, since you need to tune the car. So if you add other stuff, you'll have to re-tune) as otherwise the standard ECU is known to revert back to stock settings and compensate over any gains you might have got with your mods.
The UTEC is the Engine Management System we are currently trying to organise the event for (see my Signature for thread) and we need the last car to get Jermaine over here and tune our cars.
What you see on WRC thread is the Unichip piggyback solution, which IMO is nowhere near as good a solution as the UTEC (and costs about the same)