Best Hellcat Performance Upgrades
The upgrades that actually add power and drivability to a Dodge Hellcat — tuning, pulley, intake, and exhaust, ranked by bang for the buck.
The Hellcat makes huge power from the factory, and because it’s supercharged, the highest-value gains come from boost and tuning rather than naturally-aspirated bolt-ons. These are the upgrades that reliably improve how the car drives, ranked by value. For used, OEM, and hard-to-find versions, use the eBay Motors buttons at the bottom.
1. Tune (with supporting fueling)
A quality tune is the single biggest driver of how a modified Hellcat performs — it manages boost, timing, and fueling so your hardware makes power safely. On a car running higher-octane or E85, a tune unlocks a large gain even before major hardware. It’s the foundation for everything else. Browse engine & performance parts.
2. Upper pulley (more boost)
The classic Hellcat power adder: a smaller upper supercharger pulley spins the blower faster for more boost and a big, felt power gain — always paired with a supporting tune and adequate fueling. It’s one of the best bang-for-buck mods on the platform.
3. Cold air intake
A cold air intake improves airflow into the supercharger and adds an aggressive induction note. On its own the gains are modest, but with more boost and a tune it helps the engine breathe. Choose a quality filter and confirm your tune supports it — see our best cold air intakes for the Hellcat for how to pick sealed vs open and dry vs oiled.
4. Exhaust (cat-back & headers)
The exhaust side wakes up the HEMI’s sound and frees some flow. A cat-back sharpens the note, while long-tube headers and a high-flow mid-pipe add more meaningful power (run them on a tune, and check local emissions rules — many are off-road/track only).
5. Brakes, suspension, and tires
Adding power is only half the equation. Upgraded brakes, a sorted suspension, and the right tires — including drag radials — matter just as much once you’re putting down this much torque. See our brake and suspension guides.
Start with a tune and an upper pulley for the best value on a Hellcat, then add intake, exhaust, and fueling — always tuning to match.
Find these parts on eBay Motors
For used, OEM, and hard-to-find versions of these parts, eBay Motors is the marketplace — these open live listings for each one. Prices are set by the seller.