where can i get a good snorkel exhaust kit for my 04 disco from ?

 

Snorkel exhaust kit? I'm not sure I understand what you're asking for. Are you looking to raise the intake height or the exhaust?

 

As long as the engine is running the exhaust is fine.
If the engine stalls then you have bigger problems.
And the water will not get into the engine trough the exhaust even if it were to stop running with the exhaust submerged.