Fair comment, I can't disagree with that. I'm still going to give it a go though as I love the HKS zorst but there is no chance I'm paying the retail on one of those.
Again, I'm not arguing but it states that the exhaust is SUS304 stainless steel - is this not the same material as the 5zigen exhausts ect? What I want to know is why do these rust?
It seemed to be on the welds as Andy said... also could be the flanges as they wont be made from SS. It could also be to do with the thickness of the walls of the zorst... if they use a much thinner wall then it could go quicker... after all there is moisture both inside and outside the zorst..
that answered my question, cheers guys