i have about 275 whp for right now on my evo, my goal is at least 350 whp. i bought the ngk one step colder spark plugs. i noticed (after i purchased them) that they recommened these for cars w/ 400hp or more. can and should i still be able to use them or no. anyone???

 

anyone, come on??

 

1 step colder are fine to run .... no need to worry, infact it will protect better against detonation ...

 

ok thanks