that if they are "copies", they are a pretty poor reproduction based on what I see in the pictures. My comment about my die grinder meeting an early death was a bit far-fetched - the fact is that it really wouldn't require all that much work to have made those manifolds worthy of bolting to any engine.. but that would require that the individual reponsible for installing them would have access to those particular tools and time to address the shortcomings those manifolds have upon arrival. I mean, if I really wanted to, I could spend a few minutes at the beach and dig out some sand and produce a casting with teh same finish.. Would you buy it? :)