The way most people here (IMO) see the "tuners" is ricers.
THIS is a tuner. Tuners are like promods, they have performance upgrades that do good things for the car, while mostly maintaining the "stock" look of the car. This car is also a good example of "stance" or "fitment"
This is not a good example of "stance" or "fitment" Yes, this probably took a lot of time, work, and elbow grease to achieve, but it does not help the car, and probably harms it more.
THIS is a ricer. Ricers are like the back page of the Auto-Trader that no one looks at. Ricers sacrifice performance, drivability, and basically the overall look of the car to put over-sized wings, ridiculous body kits and flamboyant paint jobs(and not in a good way, either). Usually, these cars are typical cars you see everyday on the road. Most of the time, they have no performance upgrades to them, and usually have snap on rims that go over the steelies underneath.