Hi I've brought some bosch super 4 FR78X plugs for my N15 1.6 Ambition. currently the only mod I have done is adding a K and N 57i air induction kit. Can someone please tell me if the spark plugs above are better or worse than the copper NGK ones for my car. If you can reccomed any other spark plugs then that will also be great.
Thanks for helping
Thanks for helping