I think the problem is that everyone with over 90hp thinks they can throw a intake and fart can on the car and race it. Before I think you mostly had those 'muscle' cars racing mustangs, camaros, old muscle cars etc.. until the rice aids started to infect the streets.
In short I think we can blame the japs for this also //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif