Join Date: Jan 2008
Location: 775, NV
Model: Integra GS-R
Feedback Score: 6 reviews
Just stick with OEM spec (NGK iridiums). I just replaced mine a week ago, and my gsr runs perfect, especially hitting vtec. It runs smoother throughout the rpm band too.
Correct me if I'm wrong but I don't think that JDM engines ever have the c1, I believe its only b18c for the gsr versions in Japan.