The missus and myself have a 98 Pulsar powered by a GA16DE. They aren't a bad little motor at all. Ours has got 170000kms on it and does not use oil at all.
When we got it (at 135000kms) it made 46kw's at the wheels. It was running that poorly it wasn't funny, it still had the original fuel filter on it. After a few modifications and a bit of servicing, it makes 72kw's at the wheels and ran a 16.2 at WSID recently.
They are nuts for GA16's in the states, look them up on sentra.net . The next stage with the pulsar we are buying a UD Pulley, Cams, phantom grip and i've already got the throttle body and it is going to be run by a new Emanage. Hopefully will be running low 15's.
It's no weapon, but it's good fun.