in the Omega, beat a beemer 330 who thought he was quick - just outdragged him up the A43 out of northampton. Also, in Omega, got trounced by a Jag - was wet and he got better drive of roundabout to keep level up the A420 leaving Botley, and mine went twitchy on the next bend so had to lift. Gutted, but he must have been 4x4 for that stability...
Guy in the 330 must have been a crap driver, cos my dad's got one (330Ci coupe manual) and it will easily pull away from my MV6 and that's a manual. They're about 230 BHP and a few hundred Kg lighter. Electronically limited to 155MPH at the top end. It's quite a peaky engine though (similar to the Omega's) so you do need to drive it properly -- i.e. at least 6,000 RPM before shifting up -- to get the full acceleration out of it. Better geared than the Omega too which makes it easier to keep it on the boil.
I had a bit of a challenge off a roundabout coming onto a NSL dual carriageway against a Corrado. Didn't see the model but it must have been a VR6 cos I was struggling and that was damn near hitting the limiter with really quick shifts. Funny thing was though this road had a gentle S-bend where it went under a railway bridge and the guy obviously didn't have the bottle to maintain speed through the bends so I managed to pass him easily there

I'm sure all his mates were impressed when he told them he pulled away from an Omega but I'm also sure he neglected to mention said Omega obliterated him through the bends!
Another interesting one was a Ferrari came zooming past on the M-way and I tried to keep up for fun, needless to say I didn't fare too well but I was reasonably impressed about the car's ability to accelerate well up the higher speeds as long as you keep it on the boil - shift up at 6500 RPM!
Incidentally... nice 540

I had a 540i Sport with the 6-speed manual box a few years ago, very nice car and yes it is a bit of a sleeper. Managed to creep past a 330i at full pelt in mine on a dual carriageway, there wasn't much in it but the 540 was definitely quicker. I don't think the guy was too happy, probably thought it was a kitted up 528i or something!