i searched and searched and i saw the 2.4 tb should be plug and play if you have the right year and tune but i went to test fit it and i have and 07 and the box says 6/13/07 and the plug on the tb is to big and it has 8 prongs and plug on the car only has 6 prongs and to small

 

you would need a tune to run a 2.4TB

 

i know i was dry fitting it to see if it would fit before i got the tune

 

at some point, GM switched from using an 8 pin harness for the TB to a 6 pin harness. Im going to guess the change was made in '07 and later when the ECM changed. Im unsure if any other cobalt uses a 6 pin TB, so idk if I can help you at all..