Just curious, why don't you guys use stock headers?

 

Stock are mild steel. I live on the south coast of england just a stone's throw from the ocean. Everything rusts 10 times faster round here due to the salt in the air. England is also known for a damp climate shall we say, which doesn't help matters.

Stock are £550 ish from memory
Motad Stainless ones are under £200 and should last much much longer.

No brainer perhaps?

Motad are well known for their perfromance exhausts here in the UK, having been established for almost 40 years...they know what they are doing.