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I got lucky and was one of the very first to people in california to purchase a 04' titan, before they even had them on the lot
1/06/04, whats bothering me is that it's loaded to the i teeth, 4x4, donahoe coilovers rockford fosgate pkg., leather, crew cab LE. i realy like the truck most the work needed done was inflicted by me. the thing is the first few months i had the truck it would walk straight up to 122 to 125.mph at about 4200rpm.
i took it in for service gen maintance. now it would barly hiy 112@5100rpm i've done some work ceramic headers daul 2.5" cross flow exhaust AFE cold air intake, run motgul oil w/ht105 aditive, i installed the vx pro plug & play from stillen wich i'm taking out trans slipping shift. fload motor with fuel and did not help anything i did disconnect tow pkg. no help,i,m thinking vdc next, i'm 40 year old man that plays hella hard with his toys there not for looks if i want something to look good in and fix after every weekend i'd buy American.
Alrighty....the most likely cause for your "loss" of power is you 
That truck and all of it's electronics were designed to work with what was originally engineered. The high flow exhaust may actually be your biggest hold-up. The O2 sensors are probably not getting accurate readings, the shift points have changed, etc, etc....all this without any changes to the ECU or other controlling modules.
Basically the electronics in your truck are having trouble comprehending the add-ons. The cold air intake is probably screwing with the MAF sensor, the IAC sensor, etc. Your computer is going crazy reading a dataset it was not designed to read. It can be very dangerous to start upgrading brand new rigs right off the lot...especially foreign made.
You need to contact Stillen and talk to them about reprogramming your ECU to work with the upgrades. They did a custom reprogram for me on an 03 Maxima several years ago....worked wonders. You simply tell them what you have done, all vehicle specs, and they'll do the rest. You will most likely have to send in the EPROM chip for them to reprogram....I'm not sure if they one available for that truck yet!
Hope this helps!
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