I was looking at it, and I was wandering about two things...

1. whats the circle thing for?
2. it seems like it comes with a gasket for the b-pipe...am I right?

sorry for the noob questions, hope someone can answer them for me.

 

the circle thing is a donut gasket i think

 

Donut gasket for the B pipe connection is the correct answer.... collect your prize on the way out.

 

thanks for the answers guys, but just so I get things straight, the "3 screw" end goes to the b pipe alone with the donut gasket, and the 2 spring screws goes to the header right? or is it the other way around?

do I need to re use any old gaskets? I just don't wanna throw anything away that I actually needed.....

 

The two spring screws and the donut gasket go to the header - down pipe, the three screws and flat gasket go to the down pipe - b pipe. I wouldn't recommend reusing the gaskets if possible. If the header donut gasket seems snug and clean you can try to reuse. The flat gasket types I always use a little permatex copper sealer ( it's really good and doesn't take much effort to remove too)

 

NICE!!!! I gots to increase my REP point...