Looking for a company that makes a power programmer or chip for a 01 Xterra V6 non supercharged. Anyone know of such a company?
In all honesty, its likley not worth it to chip your NA truck. The reason you see huge gains in commercials with a bunch of trucks listed is because they are playing around with turbo diesels.
Stillen or JWT might.
Its not for me its for a customer of mine. I checked Stillen and JWT no dice. I don’t think anyone makes one :?
Maybe Advise them that the money would be better spent elsewhere. The majority of people out there that talk about doing stuff like this just don’t understand that its not going to do anything for them. Push them toward another product that would have a better return for the investment. I belive that JET Performance makes a unit for the NA Xterra. 
Its likley good for 7-14 hp tops. Without supporting mods its likley less.
mike be right. Jet does make a chip for the xterra part number is 65002. its for 00-06 all engine/trans types. but its the import ecu upgrade package. where you would get a box with chip you take the ecu out of the vehicle put it in the box and ship it down to JET. they remove and put in the new chip and send it back. pointless in my opinon