I am running that 58 dollar ebay header right now. I am serious, check out my build thread lol. I do not recommend getting it. It is a huge piece of crap. And yes, you have to weld in a new o2 bung because it doesn't line up right. Everything else fit fine with mine though I didn't have to heat it up and beat it like this guy above me is saying, but it is really restrictive and poorly made. Also, why not go 4-1 or something? That 4-2-1 one isn't legal any way, might as well go all out with a toda replica or something. Hell even a megan 4-1 itr replica would be better than the ebay 4-2-1 headers.
Save your 60 dollars, that ebay header is no better than stock, in fact it is probably worse. Bottom line is if you want a decent header, you are going to spend around $300 minimum. Unless it is used and you find a deal.