I'll just toss my 2cents in. Platinums are good for regular power, but if you want to run nitrous or turbo you need copper plugs.
The only direct replacment copper plugs are Motorcraft AZFS22C. They are also one step colder. You can order them thourgh your ford dealer for around $12 a set.
I'm running them but I really could use two steps colder at my current power levels, but the only other source is TurboTom's custom plugs at $50 a set and he can make them up to 5 steps colder.
2000 Rio Red I4 Cougar
200whp & 210wtq at 9psi
254whp & 276wtq with NX 35shot
WRX TD04 Turbo, Cut Short Shifter, Strut Tower Bar, 17" ZN Wheels, Roush Springs, Starion Intercooler, NX 35 shot, HKS SS BOV, Full 3" exhaust,StreetFlight Chip
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