and I want to add,

today, I found regera Lab 3 2nd AI at Rapido Park in youtube, and AI's time is 0:48:312. I usually farming with Ferrari Pista with speed 482 kph unboosted and my record time is 0:50:160. 

So, I don't think you, with your tune, can beat 2nd AI Lab 3. even with Extra Tank

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