[snowman]

The additional switches are only on the 350 with the touch screen. If you have a 16 track pack car or a 17 without the electronics package you won't have the additional switch to control the exhaust

 

[snowman]

You are correct that the only difference between the convenience pkg and electronic pkg are the seats. If you have a base vehicle with out either pkg it is not equipped with the addition switches. Check the picture under opt 2 with out the switches and it has the base radio without the touch screen. I ordered my gt 350 this way because I didn't want the extra electronics