tuners like reiter, matech, kessel or small automotive factories like ascari and mosler were the main producers of gt3 cars during the early years of the class, but from 2009 when the GT1 class started to decline, GT3 class gained more and more popularity attracting manufactures attention. Manufactures cars have big updates year by year that tuners can't develope with the same frequency and not less important manufactures can support private teams in a way that tuners won't never be able to do.
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