Correct me if i am wrong, but the EM2 comes in 2 sizes. A bigger hollow one, which is the 25.4mm and a solid 15mm-ish one. Hollow one gives you similiar handling characteristics compared to the stock rsx-s one. Solid one gives you more oversteer, and more body roll along as well.
Just seeing if its worth it to get the EP3 R one, or if a EM2 is sufficient. I plan on possibly getting the 25.4mm one for the EM2.