So I increased the fuel and boost. I touched 130km/h on highway with factory size tires. Power increase after the tweak was outstanding. I begin to notice a gradual reduction in power every day. I thought it is just I adjusting to the power. But, few days back I really began to notice power drop. Today, I couldn't go past 110km/h on same highway. What has happened? I checked the fuel and air filter, they are good. It isn't eating oil any more and no increase/decrease in smoke.