Review on AutoGrills Spark Plug Port Insert by Mario Beckwith

Previous attempt at a coiled coil failed miserably, almost forcing me to pull out the whole head and replace or replace the entire unit but after a lot of research, the skewed one is the largest available, and it worked like a charm - the drill tools as a set are extremely expensive, but the price for individual coils doesn't get any better than this, let alone the five hundred or seven hundred dollars that he saved. You don't have to rack your brains! Highly recommended for do-it-yourselfers