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I spent over 3,000,000 Cr

on my FGT while doing Suzuka 1000KM (5Hrs race)
which between 3 races I lose 50 - 100 HP so I rebuild the engine & body rigidity restore it plus oil change.
I noticed that overhaul & body rigidity don't affect the car speed or engine 98% which you can save the money.
I did 6 endurance races without rebuilding the engine now. yes, I lost 100HP. screw 100 Hp my FGT still kicks ass, on the lead always 30 laps.
save your money to buy nice cars. =D
the only thing u need is to chane oil (50cr) that's all. skip the 500,000cr or 1,000,000cr to fix the invisible engine overhaul & body rigidity.