have a SII r34 and afaik they come out after/during year 2000
1. diff turbo
2. slightly higher torque (not too sure bout the correct figure)
3. diff interior (white background on gauge, dash, black and white on steering wheel)
4. fking ugly front bumper for some (have since changed mine)
5. diff paint - seen mainly white and bayside blue on later models
6. oil filter diff
7. coil pack cover is white instead of red on the word neo 6
not too sure bout headlights, clutch and others
notice how the steering wheel is white at the top, the door trim and the seats
bsb exterior colour
front bar / side skirts in this case have been changed to impul as well as to the gtr wing
usually 3-5k extra for a series 2 vs a series 1 for 34s