Idle Smoke. Need Input.

[fufanu180]

At lights the car begins to smoke after about a minute or so. I'm almost sure it's the turbo but I need input before I begin replacing parts to fix it.

I put circuit sports lines on the car a while back but I'm thinking I didn't put the right restrictor on the oil line, or possibly the coolant line. I'm not sure if the turbo needs any type of restrictor on the coolant lines but I figured anything is possible.

I'm looking into replacing the turbo with a gt2871r but I don't want to do that unless I'm dead certian that it's a turbo problem.

If anybody has had this same problem and figured out the culprit, please let me know what you did. I'm all ears.