Is the Alpinestars "RC" back protector a acceptable back protector for "I" group? This style fits into my jacket. http://www.alpinestars.com/RC_Back_Protector/pd/np/170/p/650164.html
If you are going to spend money on a back protector, get a good one that straps on. That is a minimal protection vs comfort style back protector for a street jacket. this is a trackday...... gear up for the crash. If you KNEW for a fact you were going to crash, what would you want to be wearing? ............ think about that, and buy whatever you decide based on that.