The right Nitrous Kit
 

I'm am looking at purchasing a EFI wet kit. The two I'm looking at are the EFI Compucar kit (jetting from 50 to 150 but there is also a 250 jet avaliable seperatly) and a ZEX kit ( 125 jet ). I've seen the compucar kit in action with some very impressive results but I have never seen a ZEX kit in a 5.0. Anyone out there had any experience with either kit if so let me know what you think.

I've had great results with the NX single nozzle EFI kits. Started with the standard 50-150hp kit, and then went to the EFI Race 100-250hp kit on my last combo.

If you want to go with an EFI plate system, they have a killer setup with dual stage capabilites with jetting up to 300hp on each stage. :D

If those are the only 2 kits you are looking at get teh NX kit i am not a big fan of the ZEX mainly because it is to limiting unlike most other kits. More hp than the "kit" was rated for is only solenoid and jet changes away if you got the small solinoids in the first place. I personally usually buy the kit with the biggest solinoids i can so that when and if the combo changes be it mine or someone elses set up it is just a jet change away. With that method though you have to police yourself and not spray more then the motor can handle though unlike maxing a kit out and it still be safe for the motor. Also some of the kits on the market will run lean if you are putting the max HP rating through it because some company's are a little optimistic on how well there solenoids really flow.