WHAT IS THE DIFFERENCE BEETWEN STOCK AND SS CLUTCH LINE?

 

The stock is made of rubber which can expand under pressure.

 

stock ones, being rubber, tend to expand under heat. This is especially problemsome on the Evo, which uses an unusally long clutch line.

Also over time, due to the heat expansion, the stock rubber clutch line can burst, rendering your car useless. I have had this happen to my own DSM a couple years ago when on its original clutch line.

This is not something that will happen with a SS version