OBX Long Tubes

[TooFast]

Anyone know anything about or purchased the OBX stainless exhaust system that includes the (AIR) long tubes, high flow cats, X-pipe and gaskets? The system is being sold for $649, less than half of all other systems I have seen on the market, how can they do that, unless it is junk? I have also read some literature that 304 stainless systems eventually start to fail due to constant expansion and contraction and they must have some ductile iron in the formula.

Thanks,

Mark