TGV delete will also work without a tune but you will likely not be able to take advantage of the opened up power without a tune.

What does a TGV delete do?

The delete essentially removes the tubing and plugs the ports. You get a CEL because you won't be passing emissions. You need a Cobb Accessport and a tune for your car.

Will TGV delete pass emissions?

TGV deletes will not hurt you since they are for cold starts. If your car is at operating temp during an inspection the TGVs are transparent...... unless the inspectors actually get into the engine bay and look for the hardware itself.