What't the difference between the Akrapovic Evolution Exhaust System and the Akrapovic Race Exhaust system besides the Evolution system being about $400 more??

the design was from the race exhaust and then tweaked for more performance and greater useability.

I thought one was titanium and the other stainless? weeeeee

that too... sry I forgot to mention that.
Thanks for catching me while I was slipping... :)