Mugen MBX-6 & 6T Shock springs
Following from the earlier release of new shock towers for their MBX-6T, Mugen Seiki have released some new shock springs for both the MBX-6 and MBX-6T. The new rear springs add two more options to the current range of springs, with the new springs harder than previous versions, featuring 9.75 and 9.5 turns.
Source: Mugen [mugenseiki.com]