Last question I swear...
 

WHEN we do destroy the factory rear-end in our 240, is there a bolt in upgrade? Or replacement gear set, spool,axles...etc.?

Thanks.

Im not sure on this but i think our rear ends are good up to like 400 hp
once again just something i think i read. dont quote me on that.

you can get replacement ring and pinion sets from www.courtesyparts.com or www.nismoparts.com. You can go to the junkyard and pick up an r200 rear end cheap. The r230 from the 300zx tt has also been used.

would that rear end work woth a 240 tranny? the 300zx