Hi there I encountered some strangely rated LSD's (Subaru but it doesn't matter does it?) Maybe you could help me decode the numbers and convert those.

Usually on UK sites diffs are rated in Nm. Lets' say havy duty centre LSD for Escos is either 50Nm or 80Nm. But I found some that are rated e.g. 20kgf-m/100rpm, 4kgf-m/100rpm, or "9 kgfm breakaway torque" on some torsen-style front diff. What those mean? Thx for input