Best Hellcat Supercharger & Bolt-On Upgrades

On a supercharged car like the Hellcat, the biggest gains live in the blower and the tune. These upgrades make the Hellcat faster and help it hold power on repeated pulls — ranked by how much they matter. Use the eBay Motors buttons for used and OEM parts, and the category links for new gear. Everything that raises boost must be backed by a proper tune and fueling.

1. A supporting tune

Everything starts here. A quality tune manages boost, timing, and fueling so your hardware makes power safely on the 6.2 supercharged HEMI — and on higher-octane or E85 it unlocks a big gain by itself. Add it first, then re-tune as you add boost. See engine & performance.

2. Upper pulley

The classic Hellcat power adder: a smaller upper pulley spins the supercharger faster for more boost and a large, felt gain. It’s the best bang-for-buck boost mod — always paired with a tune and adequate fueling. Browse supercharger & boost parts.

3. Heat exchanger & cooling

The Hellcat’s supercharger relies on its intercooler and heat exchanger to keep charge temps down. Under repeated hard pulls the factory system heat-soaks, which pulls timing and power. An upgraded heat exchanger (and pump/reservoir) keeps intake temps consistent — one of the most worthwhile supporting upgrades for real-world performance.

4. Ported snout & bigger blower

Porting the supercharger snout improves flow for more boost potential, and stepping up to a larger blower is how serious builds make big numbers. These are bigger commitments that demand matched fueling, cooling, and tuning — plan the whole package rather than bolting on one piece.

5. Fueling (the enabler)

More boost needs more fuel. Upgraded injectors, fuel pumps, and E85 capability are what let the tune actually deliver the power your hardware is capable of, safely. On higher-boost builds, fueling is not optional — it’s the foundation that keeps the engine alive.

Get the tune, pulley, and cooling right first — they’re the foundation — then step up to a ported snout or bigger blower with matched fueling as your goals grow. To help the blower breathe on the inlet side, pair it with a sealed cold air intake matched to your tune. New to the pulley game? Start with the how to choose a pulley & tune decision guide before you buy.