(1) Under the hood a plate will say VG30DETT as opposed to VG30DE. (2) If you look at your gauge and there is not smaller PSI gauge there it may not have turbos. (3) Almost all turbo equiped Z's came with wings. If you don't have one, chances are you have have NA or Non aspirated. Also you'll noticed under the hood a lot of red tags saying "Twin Turbo" if those are not there even more chance it's not a TT or "Twin Turbo". This is just at a glance stuff that may help. I tried to make this as friendly as possible. Also since you are fairly new expect critisism and heckle but take it lightly as this board is riddled with sarasim and ridicule. But welcome and appreciate you becoming a member. Welcome to Twin Turbo.NET.