Our Subaru splined input shaft kit is available as an option for ant RJES bell housing. It allows the use of the complete Subaru clutch kit of your choice, turbo or naturally aspirated, including the 240mm STi clutches and the dual mass flywheel (although duel mass flywheels are not recommended). The shafts were developed at the request of drag racers, and as such have been made from a very high spec material (heat treated maraging steel). We are considering offering then from a less exotic material too for less extreme applications if there is enough interest and a significant price reduction.
The shaft kit can be retro fitted to any existing RJES bell housing with no machining needed. Note however that early RJES bell housing castings did not clear the 240mm clutch. If you are thinking of upgrading your existing bell housing purchased before 2007, please get in touch first. The shaft is not suitable for use in VW bell housings, as used with adaptor plate type conversions.