The Racing Line Higher-Output Ignition Coils in 'R' blue are a direct plug-and-play upgrade from the OE ignition coils. Whether an engine is standard or Stage 3 tuned, it will immediately benefit from the greater energy output and stronger, more consistent spark generated by a set of Racing Line Ignition Coil Packs. The Racing Line Higher Output Ignition Coils deliver a 10% increase in output energy versus OE. This greater output is perfect for drivers looking to maximise output from either their stock or modified car. Why has Racing Line determined a 10% increase in output energy for their Coil Packs? Because this is the optimum increase level, as beyond this, no additional benefit is gained, yet the coil's internal temperatures begin to rise sharply. At this level, Racing Line’s Coil Packs can maintain coil voltage under load with little or no drop-off, performing consistently from idle through to the shift point or red-line. Replacement is all the more worthwhile on older engines still running the OE Coil Packs. A new set makes a great preventative maintenance upgrade to avoid the risk of misfires caused as the OE Coil Packs age and gradually break down. Fitment couldn't be an easier. These are a simple plug and play replacement. Remove the OE Coil Packs, replace with the Racing Line Higher Output versions. Three color choices are available – Blue, Red, or Grey. Coils are sold individually - please remember to order in sets of four or five as required.