Can some one tell me what the catch tank bit bolted under the throttle body does?

It goes to a charcoal canister according to the diagrams? I have removed the metal fuel lines as part of my single turbo conversion and wondered if I can connect the catch tank directly to the pipe on the bulkhead going to that charcoal canister with a straight pipe or is the factory rubber ppe 'S' shaped for a particular reason?

Cheers
Lee

 

About a quarter of the way down this page:
http://www.fd3s.net/emissions.html
They talk alot about a catch tank.

 

Thanks for that link.. So now I now what it does I need to know if I can connect with a straight pipe to it in place of the 's' shaped pipe currently on it?

Thank you
Lee