Has anyone put a Jet chip or any other ECU upgrade on their 2004 Maxima?

What was you hp gain?

Any problems?

 

I've been asking for input on this upgrade but never receive any quality responses. An ECU upgrade would be the most attractive upgrade to me.

 

Unless you have forced induction, chip upgrades usually don't do too much. You can figure 3-5 hp usually. But that was years ago, the newer engines are so regulated that chipping them sometimes does more harm than good. And without a doubt it voids your manufacturers warranty. Hardly worth it. Many other minor mods that will get you the same don't void your warranty.