used the small block ones 3 years ago...flanges and tubes were thicker than the hedmans they replaced. I think they're made by flowtech or dynomax, but all the "cheapie" headers are the same basic config, except the hedmans are a little thinner flange (1/4" vs 5/16) and tube (IIRC 18ga vs 16ga) and hedmans now come with ball-and-socket collectors

fit good with no massaging on my M body, came with hardware and nice graphite gaskets.

I didn't use the coated ones