Quote Originally Posted by ILuvDetailing
IMO A 160kph cruising speed is a bit of a stretch for an Astra, maybe for a stretch but not a constant speed.

IMO to have a solid ride at high speeds, you should have good suspension, low center of gravity, good set of brakes, performance tires, and good aerodynamics (for that all important downforce) , I don't think helf or weight has anything to do with it.
pre... Opels can cruise upto 200kph (will just take them a LOOOONG time to get there). read this in C! when they where in Germany and was cruising in the authobahn.

and also, newer jap cars can also cruise comfortably at 160kph (with just an OEM spoiler).