Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.
I had a VR up until 6 weeks ago. The only perfomance mods were air intake and cat-back Just got myself a VS which is stock as a rock, and the VS feels quicker.
When you are talking power figures for "going harder" it basically is all about KW's / HP. What else makes your car go faster?
The VS had the Ecotec engine, most of the VR's had the Buick 3.8 in them. Not sure which engine went harder. I'm assuming the VS's did.