Going to be ordering a CTS Stage 2+ g'box soon, but wondering whilst the current box will be off, what else can i squeeze in there ?

I want to get a new clutch, and was told to get an AP organic clutch (as the car is used every day), but I just spoke to a mate who had a AP in his Scoob which went very bad ... aparently its becoming very common for this fault occuring.

Anything else in that department to change ?