The Texas-based firm offers the H1000 Last Stand as a package for any 2021-onwards Hellcat-equipped version of either car - including the Jailbreak, Redeye and Super Stock.
Modifications to the 6.2-litre HEMI V8 include an uprated supercharger (which remains stock on the Redeye), upgraded fuel injectors, a new high-flow induction system, a new pulley, stainless steel long tube header, high-flow catalytic converters and a crankcase ventilation system.
All that, in tune with a new ECU map, raises power to the 1,000bhp mark along with 948Ib ft of torque - a 283bhp and 292lb ft increase over stock examples of a 2023 Hellcat - all while running on pump fuel.
As a result, both the Last Stand Challenger and Charger are said to be capable of a 2.8 second 0-60mph sprint (with a one-foot rollout) with the ¼ mile taken care of in 9.9 seconds.
Alongside the power boost, Hennessey will also fit new carbon fibre aero parts and 20-inch alloy wheels plus some additional ‘Last Stand’ graphics. Just 100 packages will be made available - 50 for each of the Challenger and Charger.
John Hennessey, company founder and chief executive officer, said: "The Challenger and Charger are two of our most popular models, with monstrous horsepower in a comfortable and capable chassis. While it's sad to see the 6.2-litre HEMI go, I'm pleased to commemorate its near-decade run with our unique 'Last Stand' models that pair the 1,000-horsepower output with the sleek look of carbon fibre and other exterior performance upfits."
If you’re more of a Chevy person, Hennessey also recently introduced the Camaro ZL1-based Excorist Final Edition, itself offering 1,000bhp. Now, there’s a drag race in the making…