The OE dual system on the FGF had the transverse muffler, if you are trying to keep a stock configuration.
Common practice at your local muffler shop might be to run it without the rear crossover muffler, unless you specify differently, so make sure you know what you want and discuss it with the shop before agreeing to any work.
The large transverse muffler will also tone down the decibels a bit... might make a difference to neighbors and car alarms.
If you are running a 2bbl, and plan to keep it that way, remember that too little backpressure can also be bad.
