The VTEC engine, immitated by many, was produced by Honda, and basically at around 4500 RPM's, messes with the valves and camshafts and times them differently, and there is a large HP jump as well as torque. Basically, at around 4500 RPM, hold on tight.
At about $15,000 for a brand new GS-R, it is an extremely good value. You get a very good quality car, and a fast car, for a reasonable about of money. In Japan, for a little more, you can purchase and Integra Type R. This car has improved handling, 190 HP under the hood, and much more.