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BBK Performance
Underdrive Pulley Kit (5.7L/6.4L)
SKU: 1653
+10
Horsepower
+8
Torque (ft-lbs)
Estimated Install Cost
Total with part: $280–$460
What You'll Need
Serpentine belt tool, basic hand tools.
First-time modders or complementing existing upgrades
Compatible Vehicles
Fits 2011-2023 Challenger 5.7L and 6.4L HEMI.
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Why Install This?
Benefits
- Incremental gains that stack well with other bolt-on mods
- Easy bolt-on installation — most people can do this in their driveway with basic tools
What Does This Do?
Your engine spins the alternator, A/C compressor, and water pump via a serpentine belt. Each accessory steals horsepower to operate. BBK's underdrive pulleys are slightly smaller diameter than stock, which spins these accessories slower — freeing up 8-12 HP that was being wasted. The CNC-machined aluminum pulleys are also lighter than stock steel, reducing rotational mass. Installation is simple: remove the old pulleys, bolt on the new ones, and re-tension the belt. The only potential downside is very slightly reduced alternator output at idle (won't affect anything with stock electrical loads), and slightly less A/C at idle (most people never notice).
Fitment Notes
Fits 2011-2023 Challenger 5.7L and 6.4L HEMI.
Technical Details
CNC-machined underdrive crank and alternator pulleys. Frees 8-12 HP by reducing accessory drag.