nope a sound limit is a sound limit no matter what car you have
try and watch a few videos of people going round silverstone on youtube it will give you an idea, but make sure its the new version
give my vidoes a few extra views
http://www.youtube.com/watch?v=76MPP1_gU...mp;feature=plcp excuse my language when a focus goes down totally the wrong line and messes up my lines and the red focus that holds me up for over half a lap

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Red Escort 1.6LX
Then - Red Escort 1.4
Then - Silver Fiesta ST 170BHP
Then - White Fiesta ST MR200+
Now - Mitsubishi Evo IV Forged 2.3 500BHP
and Mondeo Mk3 2.0TDCI