Most if not all of the aftermarket cans work with the stock passenger footpegs. Based on the few aftermarket cans that I've heard the larger oval cans are a little quieter than the round cans. My MG Ti cans dent really easily. If I was looking for replacements I'd go CF.
The crossover will effect how the bikes sounds too. The stock crossover is the quietest, Stucchi/Ferracci is a little louder than stock, and the Mistral is louder still.