I like my K&N FIPK gen 2 it has a little more of a power gain than the 77 does.
http://www.knfilters.com/search/prod...x?Prod=57-6012
http://www.knfilters.com/search/prod...Prod=77-6012KG
You should have a lot of responses to this question, Its really a personal preference. Pick one you like and have fun. Ebay is a pretty good place to find these items for sale from any manufacturer. Search suggestions:
Titan K&N
Titan Volant
Titan AEM
etc.................
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2004 Titan 4X4 LE Crew Cab
Blizzard White,Off Road Package,DVD Theater System ,Big Tow,E-Lock,Side Air Bags,Leather,Heated seats,Navigation,PWR Sunroof,Utili track,Bed Extender,Rear Sonar
Rockford trashgate crapio system,Ziebart rust proofing,2005 Rear Differential Cover.
Tekonsha Prodigy trailer brake controller
K&N Gen 2 FIPK
Throttle Body Spacer (screen removed)(AutoExtreme)
2 degree timing advance
Hellwig Rear Sway Bar (Hellwig Direct)
Nismo Pedals
Banks Monster Exhaust (Yournissanparts.com)
Locking Gas Cap (Courtesy parts)
Sirius Satellite Radio
Monochromatic White Front Grill Surround
Altezza Gen 1 LED Tail Lights, LED 3rd brake Light
Black Halo pencil beam head lamps
Lund Hood Deflector
PRG Mini Lift
BFGoodrich 315/70-17's including spare tire
Axle Vent Mod
Bed Light Mod