This is a sub-page of Need for Speed: Rivals.
Most vehicles in this game only have sounds leftover.
Here's the interview with Markus Nilsson during 2013 Gamescom: https://youtu.be/OWRvjh3Limg?si=qPK7MlgzplztBQ69 (0:30 - 0:47) "You have an idea of the total amount of cars or is it still moving?"
"it is always still moving but still licensing issues, sometimes we build the car and it's finished and it's been in the game for months and then all of a sudden you can't have it because something is wrong with it" -- Markus Nilsson
Audi A4#
Sadly no car model, only car performance configs.
Acura NSX#
A couple of files referencing an Acura NSX can be found (NFS Pro Street NSX sound files in NFS Rivals game files... no idle sounds), if the car appeared in the game, it would likely be the NA2 model.
NFS08_Acura_NSX_NA_ENG_HiLdAccel_EV03-PnT
NFS08_Acura_NSX_NA_ENG_LoLdAccel_OB_EV03-PnT
NFS08_Acura_NSX_NA_ENG_LoLdDecel_EV01-PnT
NFS08_Acura_NSX_NA_EXH_HiLdAccel_EV03-PnT_V2
NFS08_Acura_NSX_NA_EXH_LoLdAccel_EV03-PnT
NFS08_Acura_NSX_NA_EXH_LoLdDecel_EV01-PnT
Aston Martin DB9#
A couple of files referencing an Aston Martin DB9 can be found
VEH_Aston_Martin_DB9_ENG_DeNoise_DecelRamp01_Hybrid_Close_NiD
VEH_Aston_Martin_DB9_ENG_DeNoise_HighLoadRamp01_Close_NiD
VEH_Aston_Martin_DB9_ENG_DeNoise_LowLoadRamp01_Hybrid_Close_NiD
VEH_Aston_Martin_DB9_EXH_DeNoise_DecelRamp01_Hybrid_Close_NiD
VEH_Aston_Martin_DB9_EXH_DeNoise_HighLoadRamp01_Close_NiD
VEH_Aston_Martin_DB9_EXH_DeNoise_LowLoadRamp01_Hybrid_Close_NiD
VEH_Aston_Martin_DB9_ENG_DeNoise_HighLoadRamp01_Close_NiD_SHORT
VEH_Aston_Martin_DB9_EXH_DeNoise_HighLoadRamp01_Close_NiD_SHORT
Idle sounds included.
Aston Martin DB9 ENG Idle
Aston Martin DB9 EXH Idle
Bugatti Veyron#
A couple of files referencing a Bugatti Veyron 2005 can be found
VEH_Bugatti_Veyron_ENG_AccelRamp06_Close_NiD
VEH_Bugatti_Veyron_ENG_AccelRamp07_Close_NiD
VEH_Bugatti_Veyron_ENG_Decel01_Close_NiD
VEH_Bugatti_Veyron_EXH_AccelRamp06_Close_NiD
VEH_Bugatti_Veyron_EXH_AccelRamp07_Close_NiD
VEH_Bugatti_Veyron_EXH_Decel01_Close_NiD
VEH_Bugatti_Veyron_ENG_AccelRamp07_Close_NiD_SHORT
VEH_Bugatti_Veyron_EXH_AccelRamp07_Close_NiD_SHORT
Idle sounds included.
Bugatti Veyron 2005 ENG Idle
Bugatti Veyron 2005 EXH Idle
Chevrolet Bel Air 1956#
Only Idle sound.
Chevrolet Bel Air 1956 ENG Idle
Chevrolet Caprice PPV 2013#
An unused Redview County Police Department standard issue patrol car. Oddly enough, its data is stored in the "Traffic" vehicle category instead of "Player". 
Chevrolet Corvette C5#
Only Idle sounds.
Chevrolet Corvette C5 ENG Idle
Chevrolet Corvette C5 EXH Idle
Chevrolet Corvette C5 GTR#
A couple of files referencing a Chevrolet Corvette C5 GTR can be found
VEH_Chevrolet_Corvette_C5GTR_ENG_Decel01_Close_NiD
VEH_Chevrolet_Corvette_C5GTR_ENG_HighLoadRamp01_Close_NiD
VEH_Chevrolet_Corvette_C5GTR_ENG_LowLoadRamp01_Close_NiD
VEH_Chevrolet_Corvette_C5GTR_EXH_Decel01_Close_NiD
VEH_Chevrolet_Corvette_C5GTR_EXH_HighLoadRamp01_Close_NiD
VEH_Chevrolet_Corvette_C5GTR_EXH_LowLoadRamp01_Close_NiD
VEH_Chevrolet_Corvette_C5GTR_ENG_HighLoadRamp01_Close_NiD_SHORT
VEH_Chevrolet_Corvette_C5GTR_EXH_HighLoadRamp01_Close_NiD_SHORT
Dodge Charger 2006#
A couple of files referencing a Dodge Charger 2006 can be found
VEH_Dodge_Charger_2006_ENG_Decel03_Close_NiD
VEH_Dodge_Charger_2006_EXH_Decel03_Close_NiD
VEH_Dodge_Charger_2006_EXH_Ramp01_Close_NiD
VEH_Dodge_Charger_2006_EXH_Ramp06_Close_NiD
VEH_Dodge_Charger_2006_EXH_Ramp01_Close_NiD_SHORT
Idle sounds included.
Dodge Charger 2006 ENG Idle
Dodge Charger 2006 EXH Idle
Dodge Viper Copperhead#
A few files referencing a Dodge Viper GTS can be found
VEH_Dodge_Viper_Copperhead_ENG_OB_Decel01_Close_NiD
VEH_Dodge_Viper_Copperhead_EXH_OB_Decel01_EQ_Close_NiD
Idle sounds included.
Dodge Viper Copperhead ENG Idle
Dodge Viper Copperhead EXH Idle
Dodge Viper GTS#
A few files referencing a Dodge Viper GTS can be found
NFS14_Viper_GTS_EXH_HighLoadRamp_Dyno_NiD
NFS14_Viper_GTS_EXH_LowLoadRamp_Dyno_NiD
Dodge Viper RT/10 (1992?)#
A few files referencing a Dodge Viper GTS can be found
NFS14_Viper_RT_ENG_HighLoadRamp_Dyno_NiD
NFS14_Viper_RT_ENG_LowLoadRamp_Dyno_NiD
No Idle sounds.
Ford GT40#
Only Idle sounds.
Ford GT40 ENG Idle
Ford GT40 EXH Idle
Ford Mustang Boss Falken Tire#
A couple of files referencing a Ford Mustang Boss Falken Tire can be found
VEH_Ford_Mustang_Boss_FalkenTire_ENG_Decel01_Close_NiD
VEH_Ford_Mustang_Boss_FalkenTire_ENG_HighLoadAccel_Close_NiD
VEH_Ford_Mustang_Boss_FalkenTire_ENG_LowLoadAccel_Close_NiD
VEH_Ford_Mustang_Boss_FalkenTire_ENG_HighLoadAccel_Close_NiD_SHORT
Idle sound included.
Ford Mustang Boss Falken Tire ENG Idle
Ford Mustang GT 2014#
Inside the game files of July 1st, 2013 Build, it existed as a car for racers side ("Customization" Folder is clear proof, since only racer cars have it, cop cars don't). Later during the development, the elements and values of the car were removed and have never been seen again.
How the structure looked in the game files for this car:
(MAIN Folder) Car_Ford_MustangGT_2014
(Files) -> car_ford_mustanggt_2014_bundle_networkregistry_Ps3
Car_Ford_MustangGT_2014_Bundle
Car_Ford_MustangGT_2014_Customization
car_ford_mustanggt_2014_Mesh
Car_Ford_MustangGT_2014_Physics_Ps3
Car_Ford_MustangGT_2014_RaceVehicleConfig
Car_Ford_MustangGT_2014_Reference
Car_Ford_MustangGT_2014
FXPrfb_Car_Ford_MustangGT_2014
LghtPrfb_Car_Ford_MustangGT_2014
(Subfolder) Car_Ford_MustangGT_2014
(Files) -> bodybundlecollection
hiqty_audio
hiqty_audio_networkregistry_Win32
rimbundlecollection
(2nd Subfolder) Car_Ford_MustangGT_2014_Bundle
(Files) -> MeshVariationDb_Win32
(3rd Subfolder) Customization
(Files) -> ??? (I need to find out if the car had any personalization during that time).
(4th Subfolder) Textures
(Files) -> ??? (I need to find out what textures it used during that time).
Fun Fact: Ford Mustang GT Movie Car had its own main folder called "Car_Ford_Movie_mustang_2014" with subfolders and files, but once they wanted to remove the regular Mustang GT 2014 from their game, they replaced everything with the values, mesh, etc of Movie Car, and "Car_Ford_Movie_mustang_2014" was removed since it was useless. Therefore, Movie Car now uses the "Car_Ford_MustangGT_2014" folder, subfolders and files with the same name, but now with its own elements and values.
No idle sounds.
Ford Mustang GT 2015 Widebody#
Unreleased widebody kit for the 2015 Mustang GT, proving that it was possible to have both personalization and customization options in Rivals at the same time, but due to lack of time, the customization option was instead added in 2015.

Hummer H3 Alpha PPV#
A cut Redview County Police Department standard issue patrol car. There are 4 strings in the game files referencing this vehicle.
Hummer H3 Alpha Police Patrol Vehicle
Hummer
Hummer H3 Alpha Police Patrol Vehicle
Hummer
Lamborghini Aventador LP 700-4 (Racer)#
The car was also available for racers in the E3 build until it was removed and became a cop exclusive vehicle (You can see the pictures and videos in: "Prerelease -> E3 (10th June, 2013) -> Videos or Pictures" to see the car in action as a racer).
Lamborghini Gallardo LP 560-4 (Racer)#
The car was also available for racers in the E3 build until it was removed and became a cop exclusive vehicle.

McLaren MP4-12C (Racer)#
The car was also available for racers when the game was starting to be developed until it was removed and became a cop exclusive vehicle (You can see the pictures in: "Prerelease -> Before & During Pre-Alpha -> "Career Overview Design Early Concept" or "Spikestrip Deploy Concept" to see the car in action as a racer).
Nissan 350z#
A couple of files referencing a Nissan 350z can be found
VEH_Nissan_350Z_ENG_Decel_Ramp02_Compressed_Close_NiD
VEH_Nissan_350Z_ENG_HighLoadAccel_Close_NiD
VEH_Nissan_350Z_ENG_LowLoadAccel_Close_NiD
VEH_Nissan_350Z_EXH_Decel_Ramp02_Compressed_Close_NiD
VEH_Nissan_350Z_EXH_HighLoadAccel_Close_NiD
VEH_Nissan_350Z_EXH_LowLoadAccel_Close_NiD
VEH_Nissan_350Z_ENG_HighLoadAccel_Close_NiD_SHORT
VEH_Nissan_350Z_EXH_HighLoadAccel_Close_NiD_SHORT
Idle sounds included.
Nissan 350z ENG Idle
Nissan 350z EXH Idle
Pagani Zonda 2006#
A couple of files referencing a Pagani Zonda can be found
VEH_Pagani_Zonda_2006_ENG_Decel01_Close_NiD
VEH_Pagani_Zonda_2006_EXH_Decel01_Close_NiD
VEH_Pagani_Zonda_EXH_LowLoadRamp01_Close_NiD
VEH_Pagani_Zonda_EXH_PitchMaped_HighLoadRamp02_Close_NiD
VEH_Pagani_Zonda_EXH_PitchMaped_HighLoadRamp02_Close_NiD (there are 2 exactly the same sound files)
Idle sound included.
Pagani Zonda EXH Idle
Porsche 918 Concept Study#
Inside the game files of July 1st, 2013 Build, it was probably supposed to be a car for racers side. Later during the development, most files related to the car were removed and have never been seen again.
How the structure looked in the game files for this car:
(MAIN Folder) Car_Porsche_918SpyderConceptStudy_2010
(Files) -> CamouflageVariation
Car_Porsche_918SpyderConceptStudy_2010_Camouflage
In vanilla game files, the only thing left from this car are the Audio blueprints that the Porsche 918 Spyder is now using.
Porsche 928#
A couple of files referencing a Porsche 928 can be found
VEH_Porsche_928_V8_ENG_AccelRamp01_Close_NiD
VEH_Porsche_928_V8_ENG_AccelRamp02_Close_NiD
VEH_Porsche_928_V8_ENG_OB_DecelRamp01_Pitched_Close_NiD
VEH_Porsche_928_V8_EXH_AccelRamp01_WithEQ_Close_NiD
VEH_Porsche_928_V8_EXH_AccelRamp02_WithEQ_Close_NiD
VEH_Porsche_928_V8_EXH_OB_DecelRamp01_Pitched_Close_NiD
Idle sounds included.
Porsche 928 ENG Idle
Porsche 928 EXH Idle
Porsche 996 GT3#
Only Idle sounds.
Porsche 996 GT3 ENG Idle
Porsche 996 GT3 EXH Idle
Porsche Panamera#
Included in the games credits.
Toyota#
Included in the games credits.
TVR Chimaera#
A couple of files referencing a TVR Chimaera can be found
VEH_TVR_Chimera_ENG_Decel02_Picthed_Close_NiD
VEH_TVR_Chimera_ENG_Ramp01_Picthed_Close_NiD
VEH_TVR_Chimera_ENG_Ramp03_Picthed_Close_NiD
VEH_TVR_Chimera_EXH_Decel02_Picthed_Close_NiD
VEH_TVR_Chimera_EXH_Ramp01_Picthed_Close_NiD
VEH_TVR_Chimera_EXH_Ramp03_Picthed_Close_NiD
VEH_TVR_Chimera_ENG_Ramp01_Picthed_Close_NiD_SHORT
VEH_TVR_Chimera_EXH_Ramp01_Picthed_Close_NiD_SHORT
Idle sounds included.
TVR Chimaera ENG Idle
TVR Chimaera EXH Idle
Ultima GTR#
A couple of files referencing an Ultima GTR can be found
VEH_Ultima_GTR_V8_ENG_Decel_Pitched_Close_NiD
VEH_Ultima_GTR_V8_ENG_HighLoadAccel_Pitched_Close_NiD
VEH_Ultima_GTR_V8_ENG_HighLoadAccel_Pitched_Close_NiD_Competitor
VEH_Ultima_GTR_V8_ENG_LowLoadAccel_Pitched_Close_NiD
VEH_Ultima_GTR_V8_EXH_Decel_Pitched_Close_NiD
VEH_Ultima_GTR_V8_EXH_HighLoadAccel_Pitched_Close_NiD
VEH_Ultima_GTR_V8_EXH_LowLoadAccel_Pitched_Close_NiD
Idle sounds included.
Ultima GTR ENG Idle
Ultima GTR EXH Idle