Alright, I am garaging the FD for the weekend to fix all the problems, while I am at it I am going to change the oil and filter, and I wanted the change the plugs. Now I run the NGK Bur 7's or whatever, should I buy the 9's instead? Also where would be the cheapest place to buy? I know there are threads like this but this is an update.

 

checkers has the cheapest place i have found (about 6.25 per plug). and yes, run 9's all the way around, i mean it cant hurt.

 

Alright, I will run 9's, but I don't have a checkers where I live.

 

you should run 7 and 9 plugs unless you are making over 340 hp. Since you don't have that many mods, stick to stock plugs.

 

I have just about the same mods as you and I run 9's all around with no problem, but hey, what do I know.?

 

or you are running the stock IC over stock power levels

but seriously, where did the magic number of 340 come from?