The Akrapovic Evolution exhaust system removes the front catalytic convertors so is deemed to be not road legal and to be sold as an off road use product only. You will need the deleter or an ECU tune if you fit the Evolution exhaust. See in this video between the O2 sensors that it is straight pipe
The Slip on is just the rear muffler and it joins up to where your factory rear muffler joins to the mid section. This would also sometimes be termed as a cat back.
The Eisenmann Sport or Race come with a rear muffler and also comes with connecting pipes for easy installation.
Hope that answers your questions.
If you want some images posted of the Akrapovic or Eisenmann let me know, i have plenty.