While changing oil, I just noticed that there are two large studs going through holes in the motor mount, they are not threaded into anything - like the nuts are missing....can anyone tell me if there are supposed to be nuts on these (I would think so, unless theyre just guides) and if possible the size nut it should be? I would take it to the dealer to get them put on but dont want to go there with the nitrous installed

This is the drivers side mount, from the rear of the motor:

 

can you look at the underside
capture nut inside the mount or is it just threaded ??
Looks wierd

 

there are no nuts. the mounts are threaded. those actually look like aligment studs.

 

Those are just your motor mount bolts. You can see the nut made onto the frame pad jst up from the end of the bolt. Look down from the top side of the engine compartment and you will see all 3 heads of the motor mount bolts.