Just a heads up case few have noticed, But you can now buy stage 3 engine tune and weight reduction without buying stages 1 and 2, Should save some of you guys/girls cash that haven't noticed this yet
Yeah I have done the same, But I went to stage 2 by mistake and thought hold on I can buy it so made a note of hp and pp
bought S1 then went back to S2 and it was the same, So it seems that the cost has changed because they include S1 and S2
I'm positive it works. I just bought a V12 Vantage and put stage 2 on it. With other upgrades it is 540PP, switching back to standard tuning it's 536PP.
It might be one of the in-game updates, or maybe part of 1.01