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<div class='quotetop'>QUOTE(B@F @ Jul 15 2006, 09:40 PM) [snapback]243455[/snapback]</div>

Well... let's make a quick walkthrough...
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- When you are driving at top speed (fastest gear stage, engine cannot go faster) and go on the slope up (bridge, banked corner etc.), you will reach some kind of warp speed - engine roars very high, everything runs behind you very fast and the grass doesn't slow you down (!). When you make a drift (it's quite easy now), you will shoot away in full speed at the moment you stop drifting. However, steering is practically impossible and you can encounter some very strange physical phenomena during jumps or along the fence - it is very easy to take off and fly almost a kilometer high. And to fall down then, of course :-).[/b]

Yeah this is a game bug, I found it only to work with the Indy car. I also found another way to activate it!
:brain:

Step 1) Select the Indy car for yourself, and set it to MANUAL gear changing.
Step 2) Select a track with a jump gap [preferably near beginning - default track is good] - to make the opponent crash.
Step 3) Give your opponent a slow car so they cannot make the gap.

Start the race. Once you opponent has crashed. Approach the wreckage slowly. When you get near, hit brakes to complete stop. Change up to highest gear, keep accelerator held down and you will creep slowly towards opponent's wreckage. When you hit/nudge it, you should bounce off and your speed will be maxed out to approx 250 Mph in 1 second! ENJOI

Cheers
Mr Shred