Not against anyone or anything, just my 0.02
I thought mainly the price you pay for DC, AEM etc big brand names are:
1) their time and effort on researching the bent, design, testing, concepts and CARB legal
2) their well-known name and consumers' confident in them
And as for OBX or Megan, they probably walk down the street to a performance store and buy one of those big brand name headers, take it home, copy and package them. As a result, they saved the cost of hiring experienced researchers or developers, which brings down the cost of the product and we enjoy it.
Then you may argue, big brand will absolutely have better quality. Consider common T304 stainless steel uses 75% iron, 20% Chromium and 10% Nikel, market price for them as of Aug, 2k7. They worth about $1.5/lb (overpriced already for fluctuation purpose) If manufacturers are to have a 50% markup on price, it will be $2.25/lb. For a header that weight about 6-8lbs, let's say 6lb. Total cost of the material is $13.5 alone, not to mention refinning it and further more procedures.
First, will Megans have wholesale @ $20 :confused makes me wonder....
Second, if materials aren't that expensive, i don't see why can't company like Megan and OBX produce same quality of goods at a cheaper price?
Thirdly, a DC header for my car, just an example to illustrate my point, suggested $520 for ceramic header and $910 for stainless steel. However; why and how sellers on ebay mark price @ $270 and $550 respectively? That's almost half of the suggested price, so it makes me think they must be generous enough to make us happy @ that price.

Yet still manage to make a profit on ebay, not to mention the seller fee they have to put into cost.
Lastly, i have heard about DC stainless steel cracking at the weld-up area, as well as OBX too. Then how can one says OBX is crap and DC is god? Maybe the welder is having a bad day in working on your item?
Personally i had a DC ceramic header, owned for 2 years, found a leakage. I replaced it with OBX stainless steel header for half of the cost, it is almost 3 years now, still in good shape, except pipes turned brown. No adverse effect. Performance wise, they feel the same. Pipe is a pipe, if one must say cheap priced company is crap, then custom made item from local shop should be crap as well, i am guessing?
Sorry for talking so much

Appreciate if you read through my whole msg!