@Tankerplays just because its the same amount of cilinders and the same block doesnt mean an R8 sounds like an huracan does. Both have different exhaust systems, the accoustic on both is different by MILES, i dont know where you pulling your data from but this sound is as accurate as it can get for GTAV.
The idle is ok, finally not another one of those sound mods which have BLASTED the fck out idle which is unrealistic as fuck