I'm not sure if you need a chip or if you can simply down load a new program to your stock computer.

A cold air intake is one of the few mods you can make to a stock engine that actually works, but i'd bet that adding one will result in some other change requirement that may be necessary for optimum performance, like a MAF sensor upgrade.

Something else that actually improves power are racing spark plug wires, the best being from Granatelli Motorsports. But say hello to noise and static on your stereo/radio, and maybe different spark plugs.

You can also modify the transmission line pressure not for power but to safely transfer power to the wheels with LESS wear and tear on internal transmission parts. Of course the new shifting firmness isn't all that smooth inside the car...it jerks the car into gear...and you might blow a CVC or axle joint or two a few times before you get to spend a few thousand on newer, tougher axles, but what's a few hundred dollars for the added fun, right?

I've changed the chips in small engines and big engines. Unless, it has a turbo the change seems to be negligible, except that now you'll have to use premium. But they do work great if you've added other modifications like an exhaust, or air filter assembly, etc. For the most part chips w/o a turbo or supercharger add about 10-15 horsepower and about 5 ft-lbs of torque. On another note if your really planning on doing several changes to the engine your better off waiting until they are done before changing the chip. Some performance shops can tune the chip to take into account the changes you've made, and really make the chip work for you and the other mods you've done. source:http://forums.edmunds.com/discussion/717/infiniti/g20/are-chip-upgrades-worth-it
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