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Yeah if you still have the stock two cats you actually don't need a muffler cause i don't have one(have the muffler just to lazy to rip the exhaust apart again) the only thing bad not having a muffler is your backpressure sucks, it back fires alot when your on the pedal. like i said with mine the glasspacks are great but that's with the two cats once i replace it with one highflow i don't know if it's gonna be louder or not so can't help you out there.
I have a 92 f350 with the 460 and a 5spd, I put the flowmaster cat back kit on it, and I am pretty disappointed. It sounds like a stock exhaust. (oh its a 70 series big block II).
Thats why its so quiet. Especially if you have the stock cat. Buy the Flowmater 50 Series SUV or a Super 40 and sell him your 70 series. I think a super 40 would sound great. I don't know how loud you want it, but Lew is right. You may be able to get by with out any muffler at all if you still have the stock cat. It depends on what you want.