baught a 1992 525IX SE, looking at 'messing around' with it. joined this site to gain useful experience about how to go about it. was thinking of 'upgrading' various parts. for those who have experience with this, could you suggest the best place to start? I was thinking of the engine, maybe swapping it for something a little meatier, but have NO experience in this field at all. the car itself is mechanically sound.