i work at advance auto parts here andi have colder plugs in my turbo civic. if u want colder ngk plug the number goes higher. 6-7 if u want colder american plugs the number goes down. not that that really matters about the american plug. for a one colder plug u want the part number
# 3330 bcpr7es standard ngk
# 3733 bcpr3ev platnum ngk

they are both listed at parts store for stock replacement for a 1990 Saab 9000 turbo hard driving plug

 

I was going to add this to the FAQ, but I didn't know this information is already there.
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About how much would it cost for 4 new plugs?

 

8 bucks at the most

 

lucky bastards. I have to pay 18-20 bucks for 4 new plugs.
And that's at the cheapest place. i hate Europe

 

Is there a negative side affect to using colder plugs when maybe you dont need them, or should you just go get the colder ones for the ---- of it?

 

i always ran 3330's in my setup they worked great....