Zex Wet EFI Kit (100 hp): 506 hp at 5,600 rpm, 547 lb-ft at 4,700 rpm
This is where the power gains started really getting serious. Nothing adds power as easily and inexpensively as nitrous oxide. Literally at the push of a button, it's possible to add 100 hp or more to just about any combination. For our test motor, we ran 100hp jetting in the Zex Wet EFI kit. The wet kit combined the nitrous and fuel into a single fogger, which we mounted in our air intake in front of the Holley throttle body. The Zex kit included everything needed to add as much as 125 hp to our injected 5.0L (more with optional jetting). The kit is unique in that it features an optional controller that is capable of learning the TPS voltage to ensure the system can't be activated unless the motor is running at wide open throttle. This is a nice safety feature, although it doesn't prevent the user from engaging the nitrous too early in the rpm range (something that will create havoc).