Here are my Custom xFiles for the DMR NNS 13 ST mod
Save your flat as a .tga
File names are
DMRNNS12stImpala = ImpalaST
DMRNNS12-13stCamaro = CamaroST
DMRNNS12-13stCamry = CamryST
DMRNNS12-13stChallenger = ChallengerST
DMRNNS13stCuda = CudaST
DMRNNS12-13stMustang = MustangST
Save your flat as a .tga
File names are
DMRNNS12stImpala = ImpalaST
DMRNNS12-13stCamaro = CamaroST
DMRNNS12-13stCamry = CamryST
DMRNNS12-13stChallenger = ChallengerST
DMRNNS13stCuda = CudaST
DMRNNS12-13stMustang = MustangST