I test drove a Vectra 2.5V6 for a week back in the late 90s. Probably 1998. A real wolf in sheep’s clothing. Nothing really on the outside to show what it was capable of. First car I drove with Traction Control.
It needed traction control too. I test drove two cars when I bought that, both pre- traction control, a front wheel drive and the 4x4, both with the 150bhp red top 16V. I drove the front wheel drive car first, and on winding roads, even that was easy to get the front torque steering and scrabbling for grip - a bit scary really.
The 4x4, on the other hand, was incredible, like it was glued to the road. It was a great car, and although I have driven all sorts of cars since, it's still the fastest thing I have ever driven around bends. It didn't have the power of the turbo version, nor the turbo lag, but more than enough to have fun with. Surprisingly roomy, and practical too with the hatchback.
Honda link: It was the lowest drag coefficient of any production car until the Honda Insight arrived in 1999.
In it's original form, without the bodykit and spoiler of the turbo version, one of the best looking mass produced cars of the modern age, IMHO. This is the really rare one...