What is the easiest way to improve or get more torque out of my 2008 frontier nismo 4x4

I have a 2005 NISMO King Cab 4X4 and, while there are alot of variations, the results are pretty much the same ... A K&N FilterCharger intake system will improve improve performance to a degree. Adding a programmer ( such as Bully Dog or Super Chips ) will give you the ability to fine tune for increased performance. A word of advise .... There are "chips" out there that claim to offer "increased MPG, acceleration, horsepower, torque ... yada yada yada" and usually list a MSRP of $300 - $400 but you can buy for something like $80 - $120 -- These "chips" are worthless junk and are nothing more than a resistor that you wire into your IAT sensor circuit on your vehicle to "fool" your engine controller into thinking it is colder than it really is. Actually creates more problems, less MPG and ZERO performance increase --- Like I said, JUNK.