A mud flap is used in combination with the vehicle fender to protect vehicle passengers, other vehicles, and pedestrians from flying pebbles,mud and other road particles thrown into the air by the rotating tire.
So it is required for the safety of others.Even if you run your car in high speeds debris may scratch your fenders, front doors and rear bumpers which come out from the speedy rolling wheels.
Its a must , help reduce dirt deposit on running board and other inner part and save metals and add pedestrians too.
Stylish one available for each and every car. Our estilo has a pvc material like , but in accessory stores (including my uncle's) the normal ones are only available which are flexible. I am talking about rigid and un-flexible like. It was more stylish and many estilo owners asked about it in roads. I got that fixed as free accessory at the dealer
Check your side sill at the front of the rear wheel arch (at the corner where the wheel arch meets the side sill)
There will be a clear transparent tape stuck there.
This is to prevent paint damage from stones thrown up by the front wheel.
It is now commonly seen ... Swift, Fabia etc.
The Front Mudflaps are critical to prevent stone chip damage, this is inspite of the the preventive measures taken by most manufacturers.
The rear ... like some others have mentioned, are for the bikers behind, and a bit for your bumper.
Most OE Front Mudflaps are pretty decent, and anyways are not that visible.
The rear mudflaps are more commonly "fugly".
You could do what I have done ... I have only the front mudflaps fitted, and the rear is bare and beautiful!!
They look good but as aditya said you should have gone in for matte finish. Then you could have got them coloured red to match your cars colour. Atleast i did that for my cars mudflaps and they look good too.