Curious, what heat range spark plugs are you guys running in your 965 turbo's?

I'm specifically after input from those of you who drive your cars daily on the street?

Obviously the W3 or W4 plugs are too cold for daily street use, so I'm curious to know whether any of you guys are running a 5 or 6 heat range plug, such as the FR5 or FR6 plugs used in the later model turbo's?

 

you can only use FR 6 in the 94 3.6T and up