[bballr4567]

Wow, that is the best description of the DI noise I've ever heard.

You are right. Its the DI. If you can pop the hood and have someone give it gas, you will be able to hear it for good.

 

[bballr4567]

Yea, you can hear the DI at idle in the Thetas. They just didnt try to hide the sound like they have on the new Regal. Kind of sad but considering the extra costs between the Regal and Nox/Terrain its understandable.