I'd say it's pretty stable. I rode in Bluejeansonfire's 330ci and he did a 6th gear pull from 70 to we don't know how fast. Definitely past the 155 mark and it was very stable.
1997 VW Jetta TDi 16v ABAt
1997 BMW M3 PT6766
E90 335i 6mt DD
2000 323i Sold
2004.5 350Z APS ST 475whp 505wtq Sold