Engine & Performance for the Dodge Hellcat
Cold air intakes, HP Tuners and ECU tuning, throttle bodies, and fueling parts that add power and throttle response to your Hellcat.
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The Hellcat's 6.2 is supercharged, which reorders every performance-parts priority you might bring from a naturally aspirated car. Air, fuel, spark, and heat are one system here, and the calibration is what ties them together — a part fitted without a matching tune is usually a part that did nothing.
Find engine & performance on eBay Motors
Used, OEM, and hard-to-find engine & performance for the Hellcat — live listings, prices set by the seller.
New Amazon parts for this category are added daily. In the meantime, browse live listings on eBay Motors above.
How to choose engine & performance for a Hellcat
The tune is the modification
On a boosted engine the calibration is what converts hardware into power. An intake, a pulley, or a set of headers each move the numbers a little on their own and a lot once the tune accounts for them. Plan the tune first and buy hardware around it.
Fuel decides your ceiling
Pump premium sets a hard limit on how much timing and boost the engine can safely take. E85 changes that ceiling dramatically because of its cooling effect and knock resistance — but it also changes the fuel-system hardware you need, so it is a decision to make before you buy for power, not after.
Heat is the real limiter
A supercharged Hellcat that pulls hard for a few runs and then feels flat is almost always heat-soaking the charge air, not running out of engine. Cooling upgrades are performance parts on this platform, even though they sit in a different aisle.
Intakes: modest alone, useful in a package
A quality intake improves induction sound and helps a tuned car breathe, but on its own it is a small gain. Buy it as part of a package with the tune rather than expecting it to be a power mod by itself.
Fitment checkpoints
- The supercharged 6.2 is shared between the Challenger and Charger, so most engine-bay parts cross bodies — confirm by model year rather than by body style.
- The Redeye runs different fuelling and a different blower. Parts for the standard Hellcat are not automatically Redeye parts.
- Tuning hardware and licences are model-year and controller specific. Confirm your year and PCM are supported before buying.
- Spark plugs on a boosted, tuned car are a heat-range and gap decision, not a "same as stock" purchase.
Engine & Performance reading on Hellcat Parts
Best Hellcat performance upgrades
The full order of operations from bolt-ons through boost.
Pulley & tune guide
Boost, fuelling, and the sequence that keeps a Hellcat alive while making more power.
E85 & flex-fuel conversion
Why E85 suits a boosted engine, the hardware it needs, and how to switch safely.
Cooling & heat-soak
The intercooler loop, heat exchangers, and why power fades after back-to-back pulls.
Spark plugs & ignition
Heat range, gap under boost, and what coils do on a tuned car.
Best cold air intakes
What an intake is worth on a Hellcat, and what it is worth once tuned.