I go with Mines way of tuning, all about engine response and lighten up your car.
My skyline is 459bhp 1245 and it has all the lightest equipments. Ive spent every mod there is, ALL but with only stage 1 turbo, because i like it like that. I wouldnt want to tune my car beyond 500
i manage to hit 1'01'477 on Tsukuba, with DS3..pretty fast
I got fastest at 59'xx" in that circuit! Seems my setup is really awesome!