Was putting on muffler today and when I took muffler out of the box there was no arrow on muffler showing flow. All the pictures show offset on the inlet side and center on the outlet side. Just opposite of my stock. Quadratec said center was outet. Called Dynomax and guy who spoke bad english said offset was inlet side. Just don't line up when I put it on that way. Fits perfect if I use the cetered hole as the inlet side, just like my old muffler was. HELP!!!!!!!!