From all that I have heard and read "double platinium" spark plugs (at least Champions) do not work well with turbos, however, they are great for N/A engines. I continue to use Champion Copper Plus plugs gapped to .040 with great success.
Magnecor competition ignition cables were also recently installed on my "S1" turbo car and I couldn't be happier with the "total result"--continued awesome performance [8)] and great highway gas mileage.
