Offset in, and center out - no offset for the exit.
I bought my Flow masters from Summit Racing, and had my own exhaust built here locally. You can just shop around on line, Summit, Ebay, and so on.
The Reason the right muffler looks crooked is because the inlet was bent when I was rear ended,
and instead of buying a new muffler, since we had to redo the exhaust anyway, we worked around it when it was redone...the second time.
Exhaust clip...
YouTube - My GTP's Exhaust
Also helps that I have an INTENSE stage 3 cam and head combo too. Its a nice aggressive cam.
~F~