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If your car sees a lot of track time, you should probably go for a plug one range colder, since your motor is under extreme loads for extended periods of time.
FWIW, I'd rather run a colder plug than a plug that's too hot. That can be catastrophic to your motor. At least with a colder plug, all you'll get is premature plug fouling/sooting and you may have to renew them more often. Better safe than sorry.
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
Last edited by WydRyd; 04-12-2007 at 04:19 PM..
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