Ah good pic. The SR20VE NEO came with the more advanced VVL (variable valve lift and timing), which is more advanced than the simple N-CVT (variable valve timing only) of the black top SR20DE. It is also more advanced than VTEC as it can switch intake and exhaust independently, although that doesn't make a huge difference in practice.

This solenoid is an on/off switch that switches to the hi-speed/lo-speed set of cam lobes. It is operated by the excellent factory ECU, or you can add a Megasquirt as a secondary ECU if for some reason you want to independently control the solenoid. You can also use MegaJolt as an RPM switch or even an MSD ignition controller to activate the solenoid. Or if you want to manually control it, use a toggle switch on the dashboard.

This controller solenoid is attached to the rear of the cylinder head. So cut a hole in the firewall to make room. Specially-built low profile versions are available if you want it to fit between the head and the firewall.

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The SR20VE was 190 PS and came in:
* 1997-2000 U14 Bluebird SSS-Z
* 1997-2000 Y11 Wingroad ZV-S wagon
* 1997-2000 P11 Primera
* 2001-2003 P12 Primera (207 PS)

And of course the famous turbo version SR20VET:
* 2001-2007 T30 X-Trail GT (280 PS)