StaffAllpar HomeMore NewsCarsTrucksUpcomingRepairsTest drives

Kenne Bell’s 901hp Hemi 392 package

by Patrick Rall on

The 6.2L supercharged Hellcat Hemi has set the performance world on fire, but Dodge fans who cannot foot the $60,000+ bill for the 707 hp Challenger or Charger are likely to find the R/T Scat Pack or SRT 392 price tags a bit more palatable.

The fact that the 6.4L makes 222 less horsepower than the Hellcat model might not sit so well with some buyers, but Hot Rod recently talked about a Kenne Bell Performance project that is under way now. When completed, the package is expected to lift the power ratings from 485 to 901.


The magazine took a 2015 Dodge Challenger SRT Hellcat to the Kenne Bell Performance to see just how much power the big beast put to the ground. While there, Hot Rod learned that their Hellcat Challenger test car put 620 horsepower to the rear wheels, and talked about Kenne Bell’s interest in the function of the IHI supercharger on the new 6.2L Hemi. Evidently, the well-known supercharger company is working on a twin screw setup for the 6.4L Hemi in the SRT 392 and R/T Scat Pack Challengers, which will be similar in its basic design to the IHI Hellcat unit.


Where the Hellcat Hemi supercharger is a 2.4L unit, the Kenne Bell blower for the 392 Hemi will have an internal volume of 4.3L and that extra air flow combined with the added engine size of the 6.4L Hemi should be able to produce 901 horsepower.

Unfortunately, that was all of the information that Hot Rod provided, but they did mention that Kenne Bell is planning to have the Challenger Scat Pack making 901 horsepower and the supercharger will only cost around $7,000. Hot Rod did the math and when you add up a car that costs around $40,000 and a supercharger package that costs around $7,000, you get a 901 horsepower car that costs somewhere around $47,000.


What was not mentioned was what other components come with the package, and whether that $7,000 only includes the supercharger and the items needed to physically install it on the engine — because that won’t be the end of the build.

Realistically, for the 2015 Challenger R/T Scat Pack to make 901 horsepower for more than a few minutes, there will need to be a few crucial items included in the project. Most notably, the connecting rods and pistons of the 6.4L Hemi will need to be replaced with tougher units, and a quick look around the internet revealed that you can get into a set of forged connecting rods for around $700 while a good set of pistons will set you back another $800. Figure another $200 for the various bolt kits and such needed to complete the forged bottom end and you have about $1,700 more invested.

When you add that into the price above, you are sitting just under $49,000, which really isn’t bad for a 901 horsepower Dodge Challenger. Making that kind of power with a supercharger will also add fuel system requirements and a proper engine tune, but it is unclear if any of the fuel system upgrades are included and I’m pretty sure that the $7,000 price of the supercharger would not include an engine tune. Even if you have to drop another $2,000 into the build for the fuel system goodies and a good tune, you have only spent around $51,000 (not including labor for the build itself) for a 901 horsepower car.


The Hellcat Hemi has a long list of other factory components that have been beefed up to safely handle the force of 707 horsepower and 650lb-ft of torque, so even if you have the 392 cubic inch Hemi in the Challenger Scat Pack making 901hp without damaging the engine, there is a good chance that you will be tearing up other driveline components including the transmission and the rear differential, but that is all part of the fun of having a car with almost a thousand horsepower. (Heat dissipation is a major factor, with the Hellcat showing little or no reduction in power over repeated runs while GM equivalents drop their power to prevent meltdowns.)

Patrick Rall was raised a Mopar boy, spending years racing a Dodge Mirada while working his way through college. After spending a few years post-college in the tax accounting field, Patrick made the jump to the world of journalism and his work has been published in magazines and websites around the world.

Know & Go screens
Employees created new FCA US app—first available to Ram TRX

Newest Ram Built to Serve models honor the U.S. Air Force

Former Ram chief engineer Michael J. Cairns

More Mopar Car
and Truck News

Some popular Allpar pages

Dodge Demon

2018 Wrangler JL

Staff details/contactsTerms of ServiceInformation is presented to the best of our knowledge. Plans change and sometimes mistakes are made. Decisions or purchases made based on this site's verbiage or images are done at the reader's own risk. Also see the Allpar News archives, 1997-2008 • Copyright © VerticalScope Inc. All rights reserved. • Mopar, Dodge, Jeep, Chrysler, HEMI, and certain other names are trademarks of Fiat Chrysler Automobiles.