I noticed that I have a strange bolt with no nut on my engine. It is oddly clean so I am worried that something fell off. Here are two pictures. They are side views of the engine taken from the driver's side and it is an Exige S.
I believe that is a stud where a triangular bracket attaches the throttle body, manifold, and engine block all together on an NA Lotus. I had to remove that triangular bracket when I installed my Supper Charger.