Its not a useless idea from the business and economical side of things Think as RALLYART ITALY or as STI, they know how many group N cars are out there competing and LOOSING against S2000 cars, and they also know that group N cars easily outnumber S2000's. Maybe not everyone will buy the R4 kit but if a percentage of the owner base does, it can still prove quite profitable. And if you think as an owner, you have a rally car that can't beat an S2000, however you paid much less for your evo X than you would for say, a Fabia, and now rally art is selling a kit that may give you a chance against the S2000's and still will cost you less... The market is there, thats why they do it!