Oem coil packs are very limited, the spark tends to weaken around the 3500 rpm range, upgrade today to the JTSVP coils and keep spark strong to 6000rpms and gain approximately 5 rwhp, and at the same time upping your mileage about a half mile per gallon, combine these with our JTSVP wires and a new set of plugs and regain and enhance the performance of your viper