Have had mine for two years...one on a Fronty, one on a Xterra. We get salt and all and the pipes have is surface rust....no scaling off like plain steel pipes. Remember there are different grades of stainless, I suspect the best grade would be hard to bend. The muffler on the other hand is as shiney as the day I put it on. Legit or not I am happy with them, especially since the price was right, they come with the ypipe and ALL the correct Nissan gaskets and they bolted up with a very minimal effort. I do know the guy stands behind them...I know of another one on a Xterra, the seam on the muffler split out....he sent a brand new muffler at no charge.