I discovered my car was slightly lacking in power so I was just about to revert to my old way of doing things (buy a better car) when I remembered the N2O thread. Hey, why not try this N2O out and leave the cars, who beat me 3 times in a row, choking in my dust (and N2O fumes).
So I bought the N2O and headed back to the track all confident of a shattering victory. I figured to use my secret weapon to blast past the competition and enter the first turn as the new leader. Bang off the start I gingerly pressed down on the N2O button, half expecting my Mazda ROADSTER to be launched off the track and be blasted through the advertising billboard at the end of the straight as if fired out of a howitzer. Then the N2O came on and my first thought was ... is it working? Talk about anti-climax. Those damn F&F fools have a lot to answer for!! With my N2O held on for the entire straight I managed to get to turn one in ... 6th place. Woohoo, talk about your completely unfair game-unbalancing mods. The unfair part is that I was charged 5000 credits for this, I want a refund!
The NOS experience in GT4 is very mild indeed. Slightly improved acceleration and top speed accompanied by a small hissing sound as the N2O is released - lucky the sound is there to tell you it is on otherwise you may not notice. Also the N2O lasts a fair while, I was in a 2 lap race which took 4 minutes to complete and I was using N2O and accelerator at the same time for most of the track. 122 A-Spec points only, hardly a fantastic achievement. Without NOS the same race was offering 140-160 A-Spec points, depending on the competition. A better driver could have won without the N2O.