The SRT4 stock coil puts out 36,000-38,000 with a slow rise time. The DCR SRT4 Coil On Plug Kit  produces  50,000 volts per coil to your spark plugs with a instant rise time. This voltage increase is enough that plug gaps can be opened up. This hotter spark will now travel through more fuel and air making a better burn in the combustion chamber allowing complete burn of fuel producing added horsepower. This is a great improvement throughout the entire rpm range from stock horsepower to full builds with precise ignition events to 11,000 rpm. This is the same Coil On Plug Kit DCR uses on all DCR builds when the most is wanted out of a specific build. This makes for a super clean install as the could have the DCR exclusive coil cover. Comes with wiring instructions, coils, coil driver, connectors and coils cover.  It can be wires in wasted spark or individual firing. This eliminates the stock could and plug wires.Search DCR SRT on eBay for more DCR products for your SRT4.