I priced the oem coils vs some of the manufacture coils (taylor, msd, and accel) that my work carries, and it made more sense to go with the Taylors over the factory OEM ones. It was only 20 bucks ish more to get the Taylors over the factory ones. I figured with one going bad, maybe more would eventually go so thats why i replaced them all in one shot. Also i knew new coils is not going to really change the performance. I just wanted the sputtering to go away after one of my coils went bad. I did also do the plugs. Whats wrong with going with the Iridium plugs? So far so good, and no issues.