NGK or Brisk Racing Spark Plugs for Extremely Modified M157 Engines
I wonder if anyone had a chance to experience NGK's R2556B-10?
Which one is better?
NGK: R2556B-10 or Brisk Racing QR12LS or Brisk Racing QR08S?
What is the difference between non-projection tip and extended-projection tip? Which one is better for M157 Biturbo Engine?


