The SRT4 stock coil puts out 36,000-38,000 with a slow rise time. The DCR SRT4 H.O. (High Output) Coil produces 44,000 volts to your spark plugs with a higher 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 with precise ignition events to 9,000 rpm. This is the same coil DCR uses up to 600hp on all DCR builds before going to DCR C.O.P. (Coil On Plug). The greater the secondary resistance the slower the rise time will be. But more importantly is that the greater secondary resistance lowers the maximum spark gap current, and drastically affects the coil's overall efficiency. The stock SRT4 coil has a high (weak) secondary resistance of around 12k ohms...MSD Coil for the SRT4 has the same weak 12k ohms...DCR Coil is an impressive 9k ohms! Extra windings in this coil versus OEM unit! Now comes with mounting hardware (4 stainless steel allen head screws and lock washers) for a super clean install. Lifetime warranty. Search DCR SRT on eBay for more DCR products for your SRT4.