I can't decide which plug to use between one step colder or two step colder. I'm currently have a Greddy TT. I want to get the HKS M-Series Super Fire Racing Plugs, but the heat range is 7. Have anyone has any experience with this HKS plugs?

here is the plug that I want to get

http://www.z1auto.com/prodmore.asp?m...ne&prodid=7072

Thanks

 

look good to me. get the heat range 7 and let us know how they are. What plugs are you running now?

 

thats a waste of money.

All you need is 6$ NGK 6668 plugs (lfr6a) or if you wanna get fancy the 8$ NGK 6619 (lfr6aix-11)

you dont need 2-step until you are well north of 800whp. And if you run E85, 1 step colder is fine even then.

 

I thought 1 step colders and call day.

 

yeah, I think one-step colder is enough but HKS only provide 2-step colder for the Z.

 

I agree with str8dum1, they are way to overpriced but if you want them or got money to blow go for it. they may give you more power!