Need advice on TWEAKIN....

I just recently won my second F car, I have the F688/s and the Please forgive me it was early in the morning when I won it but it's the red one if that helps I think it's the F689 I'll edit this when I find out but anyway, 1 has 841 HP and the other has 881 everything else is the same I took it on the max speed course and the 881 HP only got 1 MPH faster than the other(40 HP for 1 MPH I don't think so) PLEASE HELP.... THANX
 
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