Welcome..
I assume the engine is pure stock with good plugs and low miles.
Your best bet for more power is a New Air intake system.
Check out
www.4x4parts.com They speciaize in Nissan vehicles.. try calling or emailing them. there is also a discussion board. Theres probaly some in development somewhere. Start with a K&N drop in...
Is your truck 2wd or 4wd King Cab or regular?
