Hi I need to know if vortech v3 on my 370z is
 

It is CCW or CW I want a better impeller and don't know if CW or CCW

Should be same as the crank rotation

V3
 

The V3 for our platform is CCW. Just be sure that your tuner is bang on with his tune because when you start upgrading the stock Stillen kit it is pretty unreliable. If you want more power check out TopgunZ A/A kit. It's 3x the cost of an impeller but it will also add 100+ hp safely instead of 20-30 hp at a risk of not knowing how reliable it is. Plenty of people have added just the impeller without a problem so you might be ok but I highly suggest going the safer route first and then you can add all the mods you want to gain hp and not worry until you start getting close to the limits of the stock internals.

Topgun A2A is the way to go, then you can do impeller and pulley, also make sure you have oil cooler and test pipes with wide band fittings for the gauge, work like a clock.