I need some help on choosing spark plugs and there's a lot of things that I'm trying to understand about it. Next week I'll be installing IC pipes and walboro fuel pump and get the car tuned/dyno. I wanted to buy plugs to match the mods of the car with the increased of boost. Should I stay with the OEM plugs or should I go colder? If i do. How cold? I'm currently looking at NGKs

 

You're gonna a few different answers, at least one of which will say use the SEARCh function.



Personally the OE plugs have never let me down. I say stick with what works.

 

Call NGK and talk to their tech center.. they will ask you things like how much power your car makes, fuel type, how much boost and be able to give you options based on that. when i talked to the NGK tech they told me for every 10 psi you go over the factory boost setting drop your plugs heat range 1 deg. they will also ask you if you are running any type of ingnition amplifiers (aftermarket wires, COP, CDI boxes) as this will change the type of plug you need and most importantly how far the plug should protrude into the cylinder.