I would lean towards the DC as well, although I got mine for free because the welds from the pipe to the flange cracked on #2 & #3, the "ebay special" will make the same or similar power; you're more likely to had fittment and weld issuesGet a DC header. cheap headers can have cheap welds and break. You also will need a tune to see any real difference
What type of tuning would you have to get with the addition of a header