lol I wouldent go as far as saying 'solved' more tend to go bang than stay together in one peice How hard you use it, how hard previous owners have used it, milage etc all play there part I guess, I was after circa 400 or so horses and there wasnt really alot of standard bolt ons available 4 years ago good for 400(ish) when I bought it, I dont think the 321H was even on the go when I got it either so the 20G was a no brainer really.
The Sti 5- 6 boxes are 'supposedly' a wee bit stronger than the earlier ones. But like your own box would depend on previous use milage blah blah blah
ohh compared to my old turbo its laggy as fook lol