Modification is a very subjective word.
Some feel that extensive modifications will bring the best out of your ride, while others tune their machines according to road/driving conditions.
Some want to install the best aftermarket products there is to offer, while others will still go for them but make their purchases selectively according to their needs.
Some feel that the game of modification is all about gaining as much ponies as possible out from your precious, while others want their ride to be powerful yet enjoyable to achieve daily drivability.
Some feel that 10% of adrenaline in the car is enough to make their day, while others want to feel relaxed 90% of the time.
I've learned that its not much you modify, it's what kind of products you put into the car that make it so enjoyable. It's all about altering your setup for the road condition.
No point installing coilovers if you are living in a place full of start stop traffic with countless potholes.
No point going for high horsepower when you can't fully utilise the higher rev range.
No point aiming for high end torque when you see a traffic light in front of you most of the time.
These will change of course if you are aiming to hit the track every now and then.
2centsworth