resale value of 2005 harley sportster exhaust?

whats the resale value of the stock exhaust pipes and mufflers and mounting brackets for 2005 sportster 883 low
less than 15 miles use. with no scratches

Im looking for a harley davidson iron 883, drag bars and some type of custom pipes also. anybody help?

i've seen tons of regular plain old iron 883's out there for sale but im looking to buy one with some minor custom work. im looking for something with drag bars for sure and not stock exhaust. but other than that stock or would it just be better for me to buy a new one and put those on myself i guess i'd rather just go the easy way.

Are there any mods that need to be done to air/fuel mixture when changing pipes on fuel injected Harley?

2006 Dyna Street Bob, stock exhaust. I want to change out stock for some Cobra's The HD dealer said that it will void my warranty...