Keeps a car in balance if you mod the engine. If you only do the looks then you will be a rice boy and thats not going to go down well. But its hints and not just you trying to impress me. Its to impress others and to be honist if you are going to mod do it properly. Doing half and not the ohter is no good to anyone. lets say when you mod a car you want to give the impression it is fast.. and when someone feels like giving you a little race at the lights then leaving you behind eating his dust will do your original intensions no good.. you get my reasoning on how to benifit yourself? Small mods like wheels or the lights are no bog deal, but wings and stuff and big farters mean that there should be something under the bonnet and not a 1.6i doing everything.
Its just what I feel something shoudl be done properly, but after all its your car nd you hold the money all I can to is show you what should be done, what IS to be done is up to you.
Albert.