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"305 is only needed for continuous salt water imersion (e.g. under the waterline on blue water boats)."
If that's the case, then why does iPd make their system out of 405 stainless?
And remember, an exhaust faces tonnes of water, road salt, and nitric acid. When exhaust is dissolved in water, it comes nitric acid. When road salt dissolves in water, the salt water is acidic. Acids are incredible oxidizers. Let's not forget the massive variations in temperature. Everything from well under freezing to white hot temperatures, all in a matter of seconds.
A boat faces constant immersion in a relatively strong oxidizer (salt water), but it doesn't have to face the extremes in temperature.
And yes, I know that high grades of stainless tend to crack at very high temperatures (i.e. stainless downpipes). But that's rare, and more common with manifolds. By the time the exhaust passes through the turbines of a turbo, it shouldn't affect the downpipe unless I'm running well into 300hp range. I'm not going to shell out $1500 Canadian, on an exhaust that won't last the life of the car.
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