i got the full exhaust system and i just wanted to know what bolt do i need to connect it from the muffler to the i think its called B Pipe there like a place were you need a bult and a nut is already welded on does anythone know what size bold i need?
connect this

to the end of this

 

Mine is 12mm. Not sure of the length exactly but whatever works. I'm surprised you didn't get that bolt with your system, mine came with it. Maybe in that shipping mixup with your system he forgot about the bolt, since his older systems didn't have one.