The gearbox on my 1994 wrx ra has broken again. I've been told the 6 speed box is much stronger than on the original 5 speed box. Can any body tell me what is involved and what parts are needed and a rough idea of the cost to convert my car to a 6 speed box. As i am intrested in acceleration and not top speed I was told the japenese box has the best ratios, Which japenese box would I need.