[Noneone2]

Going to jump in here, hopefully lend a hand. I've done subframe bushings on my e30 as well as my Ti. First get a torch. One of the small plumber torches you can pick up at your local hardware or depot/ lowe.
Use it to heat the subframe bushing "collar" around the bushing. The key here is to not set the bushing on fire as some do but to get it hot enough to where the grease(?) between the collar and the bushing starts to bubble, almost looks like it is starting to boil. Focus on heating the collar really well.
Support the end of the subframe and give the metal center of the bushing some love with a 5lb. hammer. If it doesn't start to move apply more heat.
This method works without sending a toxic cloud of burning rubber into your lungs.
As far as the bushing you've already cut the center from (your picture) apply heat, support the frame and use a drift and work the lip of the bushing, a little tougher but it will come apart. Heat and patience.
Hope this helps.