Go and buy auto modelista if you want to put stickers and stripes and other gubbins on your car.
What I want is to see a physical change on the car when you change a muffler, or brakes, or even when you do weight reduction you can see a roll bar inside the car.
I mean for gods sake im sure if you bought a racing muffler for an Impreza I bet it wouldn't look the same as the stock one, it would look a little different. Same with brake calipers/discs are bigger and I would love to see a roll bar in my car.