Help a newb with his flow pipes

what are flow pipes? You list headers, an hpipe and a catback, what else do you need?

The flow pipes connect the H-pipe / X-pipe to the muffler. They are two different lengths.

You can work the problem backwards to figure them out.

1) take off your flow pipes, and cat back
2) hang your tail pipes
3) attach the mufflers to the tail pipes, and hangers
4) Use some jack stands to hold the mufflers up.
5) Then you can try fitting both of the flow pipes and it should be fairly clear about which one goes where..