N/A = Naturaly Aspirated
FI = Forced Induction (turbo, supercharger...)
Its QR25DE
There are no VQ25's in north america. Its found on the :
Cefiro (Japan) VQ25DD
These are the VQ applications for north america.
1995-200x
Maxima VQ30DE
2001+
Pathfinder
VQ35DE
2002+
Maxima
VQ35DE
2002+
Altima
VQ35DE
2003+
350Z
VQ35DE
The QR25DE is in the base Altima and Sentra SE-R Spec V
You'll be very hard pressed to find a legite one even at a scrap yard.
Suggestions for a B15 Sentra :
SR20DET
SR20DET GTi-R
SR20VE
SR16VE
Turbo the Stock SR20DE (roller rocker version)