I've been doing a lot of research tonight because I am getting the NX kit install Friday. I've been looking into the RPM switch boxes and how to wire it up the the TACH and Computer. In this process I saw something about a retard feature on an ign box. Do I need this? Does this have anything to do with setting the spark plugs to two steps colder? Once again pardon the ignorance.

 

You should run a plug that has a heat range colder than stock. You have to swap the plugs. The timing control retards timing when on the spray. Nobody with ls1's run these, 93 ocatane and you should be fine. Monitoring your engine while spraying can't hurt though.

 

too hook it up you need to tap into a white wire on the upper left part of the engine...i hooked my shift light up to that and had a msd window box set up there

 

Then I should be fine. I always put 93 octane even though it's getting pretty expensive nowadays.

 

i always pump 93 no matter what

are cars need premium to stay healthy