Rating this 4 stars, 3 out of the 4 stars are because the vehicles are based on the OPP (especially love the ghost OPP/SAHP cars) a very nice addition, as my town uses them quite frequently and they're terrifying to see (or not). The 4th star is because of the LODs, can't tell you how great it is to download a full pack that contains full LODs, only complaint is that the LODs are performance heavy and I agree that decreasing them a tad for performance reasons would be grand.
Only reason that this isn't a full 5 out of 5 is because of the issues that others have raised, fix those issues and it would be a full 5 out of 5 (maybe adding the correct rambar would be awesome too).
--- +1 for the minimalistic lighting.
--+1 for being lore friendly, despite being based on the OPP.
-Maybe add a 'ghost' version of the FPIS, as I see them far more than the Crown Vics/ Tahoes.