I just got the game last week, and im hooked. My Nissan SKYLINE GT-R V-spec II(R34,J) is pushing like 1072hp right now, and I threw on a Stage 4 right away, someone said something about getting more HP outta the car when you do a Stage 1 then 2, then 3.....4? Is this true? If I remember right in GT1 all you did was had to save up for the 4 and just past 1-3...or am I wrong?