i have a 86' S4 N/A RX7 that i'm going to be putting a OBX header on with a motoria duel catback and i need to get a presilencer. i've been looking at the corksport presilencer but i don't know if it's going to bolt-up between the two. thanks if anyone can help.

 

The corksport presilencer is the same length as the stock main cat. ~17.5 inches if I remember right.

 

but are the flanges clocked at the right angles?