I reckon they are holding it, with the LaFerrari, so as to maximise the new car count. I cannot imagine their sound system is what is holding them back.Maybe they're holding off on the P1 for GT7 as GT7 will have better car sounds than GT6.
I was real surprised to see that the P1 never made it to GT6 what a dissapointment Kaz.What a shame that there's only 5 McLaren's in the game and the newest one being a 2010 MP4-12C Mclaren...