I was trying to find this last night by searching through old posts but had no luck. I thought i saw a list of mods and then a recommended spark plug degree. The mods i've done are msd coils, CAI, and exhaust. Should i go a degree colder? Or should i just leave them. Another thing is that here in edmonton it'* hard to find gas over 91 octane. What type of octane does everyone usually put? I've had 92 once at a mowhawk station. And i was on the NGK site and one degree colder of a plug for my car you guys recommend the TR55 so i looked that up on the site and it brought up a list of applications. THe 92 and 93 ssei call for these plugs, is that because of the smaller pulley on the */c? And is there another part number for the TR55, or do i just go in and ask for it and they are all the same? THanks.

I'm not TOO sure, but with your mods now, you may not need cooler plugs, but I don't think they'd hurt. But if you had a smaller pulley now too, then I would get 1 degree cooler.

But I'll let someone else answer you since I may be wrong.

That would be my advice, too. When the pulley changes, go with it. But I ran the TR55'* before the pulley and did just fine.

You're after the NGK V-Power TR55, and the stock number is 3951.