I have an oil leak at the nut under the exhaust i believe it is a head bolt.The oil is coming from in between the threads of the nut and bolt. Should I try tightening that nut up or can I can I just take that nut off and put a thread tape or something on it.Should I pull the head off?  I know it is coming from there because I watched spit out between the threads.      

Awesome thanks kind of what I thought but just need a little bit of knowledge from someone that has owned and worked on one to re insure me.