So I just got the gm stage 1 plug and play sensors. I know where the top sensors is, do I just unscrew and take of stock one and plug in new on and screw back in or is there more to it? And where is the other sensor, and is that one harder to install? I'm sure I can figure it out, just want to know what I'm getting in to before I installed them this weekend.

 

As far as I can tell. Top one only has 2 screws and needs an o ring. The bottom one in right next to the fans on the charge pipe. Go in front of the right fan [if you were looking from the perspective of inside the car] and next to it should be the tiny black sensor. It also has an o ring. You might need to get under the car to get to it.

 

The gms1 sensors have one screw each instead of the two that the stock sensors came with. This is because these sensors were not made specifically for the Cobalts. The intake manifold bolt is hard to get in because the hole isn't lined up very well. You definitely need the orings.