the only mods available for the v10 are super expensive..thats why you see all of them in used car lots or just gone forever..period, i mean, how many v10 rams do you see anymore?
for exhaust..your best bet is to go 3" as for up as you can with a high flow cat..remove those 2 giant exhaust cloggers on there...3" duals i mean..not a 3" single. or if you wanna be different..go with a 4"single with a diesel aftermarket performance muffler...imo, that would be iff..and sweet
otherwise..flowpro's are inexpensive enough and quieter than flowmasters..unless you want that signature sound, there is no substitution.