FMF turbine core 2 silencer

[rcpilot_971]

has anyone used the the turbine core silencer I had to replace mine I ordered one but its a little different than my old turbine core ll just wonder what the difference was my new one has the number 2 on it ( Turbine core 2 ) the old one had a ll at the end ( Turbine core ll ) Maybe I got the wrong one ? it does say US forest service approved

Thanks Tim