guys, i have a basic question to ask, i drive 787b to grind sardegna everyday, i tuned 787b to 851PS, so everytime it drops to 850 or below i would know it's time to maintain it (usually change the oil you know for sure), however, it drops to 850PS today but everyting shows in good condition(oil, frame rigidity, engine), it's confusing, odometer shows i have driven this car more than 12000miles, so i suspect is it because this car is way too used or aged, even though it's under good maintanence but its performnance still drops? besides, i also noticed it's getting slower than it used to, i don't know if it's my problem or the car's, anyway, this is my speculation, it never happened before until today, i have no clue what it is exactly.please help me and thank all of you!!!!