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Cyberpunk 2077 Vehicle Sound Mods

Source: "Custom engine sounds pack" (Nexus mod 17888), file tweak code/engine_sounds_codes.tweak, cross-checked against the per-car tweaks r6/tweaks/krnlnik/ford_mustang_boss_302.tweak (Mustang BOSS 302 Sound) and r6/tweaks/cornmilf/jeep_grand_cherokee_trackhawk.tweak (Jeep Grand Cherokee Trackhawk Sound).

Vehicle engine audio in Cyberpunk 2077 is wired at the .tweak level: a vehicle record names one Wwise audio resource for the player car and a second one for traffic copies of the same model. This page covers that wiring, the resource naming convention, and the mod folder layout that ships it.

The .archive container and the Wwise bank internals are out of scope here; see Cyberpunk 2077 formats for the RDAR+KARK archive structure and the .wem / .opuspak / .bnk audio section.

Where vehicle audio is declared​

Vehicle audio lives in a .tweak file opened with the Vehicle package. The likely imports are the standard vehicle set:

package Vehicle
using RTDB, BaseStats, Driving

Inside the package a car block sets two audio resource fields:

CarName {
    player_audio_resource = "v_car_bmw_m3_gtr";
    traffic_audio_resource = "v_car_bmw_m3_gtr_traffic";
}

The sound pack ships exactly this shape: one small block per car, each block carrying only the two audio fields. In a full per-car mod the same two fields sit inside a real vehicle record, alongside the model, handling and UI fields rather than in a standalone stub:

<car_id> : Vehicle_4w_Default {
    ...
    player_audio_resource = "v_car_mustang_boss_302";
    traffic_audio_resource = "v_car_mustang_boss_302_traffic";
    ...
}

The surrounding record holds entityTemplatePath, appearanceName, displayName, manufacturer, a vehicleUIData block (productionYear, driveLayout, horsepower, mass, info), a fk<UIIcon> icon, the camber fields, model, tags, fk<VehicleDataPackage> vehDataPackage, the destruction block, vehWheelDimensionsSetup, vehDriveModelData, vehEngineData, tppCameraPresets, drivingParamsPanic, trafficSuspension and savable. The tweak ends by registering the record:

vehicle_list {
    list += ["Vehicle.<car_id>"];
}

A sound swap on an existing car only needs the two audio lines; the full record is what a mod that adds or redefines the vehicle carries.

Resource naming convention​

The two fields follow a fixed pattern:

  • Player-driven vehicle: v_car_<name>
  • Traffic (NPC) copy: v_car_<name>_traffic

<name> is derived from the car's internal identity and does not always match the marketing name. Two traps in the pack are worth memorising: the Mercedes-Benz SL 65 AMG uses v_car_cl_65_amg, and the Jeep Grand Cherokee SRT8 uses v_car_cherokee_srt8. Always read the exact string from a working tweak rather than inferring it from the display name.

Both resources must be set​

The engine reads the two fields as separate streams. The car the player drives resolves player_audio_resource; traffic instances of the same model that the game spawns resolve traffic_audio_resource. Set both. A mod that edits only player_audio_resource leaves every NPC copy of that car on the stock bank, so the new sound is audible only from the driver's seat and only for the player's own vehicle.

Deployment path for a RedMod-style mod​

A per-car sound mod is deployed as loose files in the game's mod tree, mirroring the two halves of the change:

base/sound/soundbanks/<car>.bnk        # the Wwise SoundBank asset
r6/tweaks/<author>/<car>.tweak         # the Vehicle package override

The r6/tweaks/<author>/<car>.tweak path is the same override route used by any other vehicle tweak, where <author> is the mod author's folder. The two known examples are r6/tweaks/krnlnik/ford_mustang_boss_302.tweak and r6/tweaks/cornmilf/jeep_grand_cherokee_trackhawk.tweak. Keeping the .tweak under r6/ and the bank under base/ means a mod manager or manual install can drop both without repacking an archive.

Audio assets: the base/sound layout​

The sound asset itself is a Wwise SoundBank placed under base/sound/soundbanks/. The pack uses one bank per car, named after the same <name> stem as the resource:

base/sound/soundbanks/350z.bnk
base/sound/soundbanks/911_gt2.bnk
base/sound/soundbanks/bmw_m3_gtr.bnk
base/sound/soundbanks/charger_srt8.bnk
base/sound/soundbanks/cherokee_srt8.bnk
base/sound/soundbanks/cl_65_amg.bnk
base/sound/soundbanks/mustang_boss_302.bnk
base/sound/soundbanks/nissan_gt_r_34.bnk
base/sound/soundbanks/subaru_wrx.bnk

Each .bnk is a little-endian Wwise SoundBank, version 140. The tweak's resource string is what the engine uses to find the bank's contents; the .bnk file name is a packaging convention, not part of resource resolution.

The InfiniteWave archive​

The pack also ships InifiniteWave_for_modders.archive (note the misspelling, "InifiniteWave"), a packaged form of the sound bank that modders can drop in directly, alongside an extracted InfiniteWave/archive/pc/mod/#InfiniteWave.sc.archive tree. The .archive is just the CP2077 RDAR+KARK container holding the same audio assets in packed form. For what the container and its compressed entries actually look like, follow the archive section of Cyberpunk 2077 formats; this page stops at the tweak-level wiring that points the game at the assets.

Nine-car resource table​

The sound pack covers nine cars. The player and traffic resource strings are reproduced verbatim from engine_sounds_codes.tweak:

Carplayer_audio_resourcetraffic_audio_resource
BMW M3 GTRv_car_bmw_m3_gtrv_car_bmw_m3_gtr_traffic
Dodge Charger SRT8v_car_charger_srt8v_car_charger_srt8_traffic
Ford Mustang Boss 302v_car_mustang_boss_302v_car_mustang_boss_302_traffic
Jeep Grand Cherokee SRT8v_car_cherokee_srt8v_car_cherokee_srt8_traffic
Mercedes-Benz SL 65 AMGv_car_cl_65_amgv_car_cl_65_amg_traffic
Nissan 350Zv_car_nissan_350zv_car_nissan_350z_traffic
Nissan GT-R (R34)v_car_nissan_gt_r_34v_car_nissan_gt_r_34_traffic
Porsche 911 GT2v_car_porsche_911_gt2v_car_porsche_911_gt2_traffic
Subaru Impreza WRX Stiv_car_subaru_wrx_stiv_car_subaru_wrx_sti_traffic

See also​