You could use your aftermarket head pipes (unless you have 2 into 1) and just slip on mufflers.
Do you need the exhaust for noise level because the 05 doesn't have catalytic converters or O2 sensors.
If it is a noise thing there has to be aftermarket mufflers that will meet the db specs.
08 mufflers have the catalytic converter inside them, the head pipes have O2 bungs that would need to be plugged.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.