camaro race car

what can I do to the camaro race car (won after the American Championship) to make it faster? I bought the stage 2 tune-up (the only thing you can buy pretty much). Is it possible to get more than 945 HP?
 
Look at the HP, remember what it is, and then change the oil. After you change the oil, look at the new HP level, and it should be around 30-40hp higher than the original...
 
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