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2023 was the last year for the iconic Chrysler 300 sedan, and the bold four-door waved goodbye with a special 300C model powered by the muscular 6.4-liter HEMI Gen 3.
The last 300C was not the only HEMI-powered 300, though; there was the 300 SRT-8 between 2012 and 2014. The 394-powered 300 was basically a Hellcat wearing a four-door body, so there are more than enough ways to enjoy it with more horsepower.
You know you are lucky if you have one of these modern American icons standing on your driveway. And now you'll have some ideas to make it even more muscular. Here is a simple guide to give it close to 200 extra horsepower at the rear wheels, supporting chassis and braking mods to handle the power boost, and the throttle response the final build deserves.
Whipple Gen 6 3.0L Supercharger Kit
The all-new Whipple Gen 6 3.0L supercharger kit is claimed to deliver over 180+ RWHP gains. Designed with cutting-edge rotor tech, optimized airflow, and patent-pending dual-pass intercooling, it provides the most power per pound of boost on the market. With a flat torque curve, the Gen 6 turns the HEMI 300 into a power monster.
Image: Whipple Superchargers
The Gen 6 kit is almost an all-in-one solution. It comes fully loaded with an MSD pre-programmed fuel pump booster, billet fuel rails, Bosch 65 lb/hr injectors, colder spark plugs, a massive heat exchanger, and an air-to-water intercooler setup. Everything is engineered for easy installation—no internal engine mods are needed. Just keep in mind that it does require a custom tune and minor clearance modifications to the hood for a proper fit. So keep in mind that it is a 99% complete kit.
What really sets Whipple apart is their unmatched engineering pedigree. For nearly three decades, they’ve led the twin-screw game, and the Gen 6 reflects that with superior components, over 40 more power gains compared to older generations, OEM fit and finish, and the same technology found in Dodge’s Drag Pak race cars.
GForce Performance Engineering Renegade Axles
When pushing serious power, stock axles won't cut it—especially on 300’s heavier LX platform. GForce Performance Engineering Renegade axles are built to handle everything from mild bolt-ons to high-horsepower supercharged setups. These are proven to withstand 800–900 horsepower and even record-breaking builds, putting down over 1,500hp at the wheels.
Image: GForce Engineering
Featuring direct bolt-in fitment, 32-spline severe-duty CVs, and aircraft-grade certified alloys, GForce Renegade axles are CNC-machined to exacting standards. Each set includes one-piece inner and outer stubs for maximum strength, plus powder-coated finishes for long-lasting corrosion protection. They’re engineered for performance without compromise.
But raw strength is just part of the equation. GForce integrates Anti-Wheel Hop Technology to keep traction consistent under hard launches and aggressive shifts. For platforms like the 300 LX, dialing in your suspension and torque management becomes even more critical with higher power levels—and these axles are ready to support the demand.
American Racing Headers Full Exhaust System incl. Headers
While you’re in there, let’s get some good noises and some more horsepower. The American Racing Headers complete exhaust system gives you the full package—headers, mid-pipes (catted or catless), and the cat-back section. The full kit will give you more horsepower, better flow, and an unmistakable and amplified growl that your 392 HEMI is famous for. The system checks every box with premium quality and American craftsmanship.
Image: American Racing Headers
Every kit is built to order in the USA using 304 stainless steel for unmatched durability and corrosion resistance. It features thick 3/8" laser-cut flanges for a perfect, warp-free seal, plus hand-ported TIG-welded inlets that ensure smooth airflow and strength under pressure. For catted systems, you’ll get 200-cell metallic substrate catalytic converters designed to withstand extreme temperatures without sacrificing performance.
The system is designed for those who want it all in one go, and it maintains the “money-no-object” vibe of this build.
Baer 15" Extreme Front Big Brake Kit
In a blown HEMI build pushing serious power, you need serious brakes, too, and Baer's 15" Extreme+ Front Big Brake Kit is where it’s at. Designed for high-performance street and track builds, it features massive 15” 2-piece rotors paired with Baer’s flagship 6S monoblock, 6-piston calipers. It is the ultimate bolt-on braking upgrade for stopping power, heat management, and consistency under extreme conditions, all with race-proven hardware and D.O.T-compliant seals.
Image: Baer Brakes
The 2-piece rotors use billet 6061-T6 aluminum hats bolted to the friction ring with aircraft-grade stainless hardware. The forged 2618 aluminum monoblock calipers feature staggered stainless steel pistons to reduce pad taper and dual dust and pressure seals for longevity. The system comes complete with brake pads, calipers, rotors, stainless braided hoses, brackets, and all necessary hardware—ready to mount behind most 19” or larger wheels. Available in Red, Black, or Silver with optional custom finishes, the Extreme+ kit is proudly made in the USA from U.S.-sourced materials.
When it comes to rear brakes, they are mostly helper units that balance the car while it’s slowing down. But if you want to upgrade, Baer also offers a matching rear big brake kit. Or you can upgrade the rears with stainless lines and performance pads to round out the system.
KW Variant 2 Coil Over Suspension System and Electronic Damping Cancellation Kit
The one last supporting upgrade to handle all that power is the KW Variant 2 Coilover suspension. It is not just for that slammed stance—and let’s be honest, slammed is not what you’re looking for with a big-power muscle sedan. KW V2s are perfect for those who demand ride height customization and rebound adjustability to dial in the perfect chassis balance for the street or the track.
Image: KW Suspension
With front lowering adjustability from 1.2" to 2.6" and rear lowering between 2.8" and 3.3", you can achieve the look you’re after. Front height is tuned via threaded shock bodies, while the rear uses an adjustable spring perch. The rebound adjustment feature lets you manage how your suspension reacts—sharpening handling or smoothing out the ride based on how you like to drive—all the while being able to handle all the newfound power.
The KW V2 kit requires the electronic damper cancellation if your 300 has electronic suspension. KW offers a specialized cancellation kit that disables the OEM system without triggering fault codes. KW is the only brand offering a solution as seamless as this.
High-Performance Tires for Better Grip
With all that added power under the hood, putting it to the ground means you need more tire. The 392-powered Chrysler 300 comes with 20" wheels, giving you room to run wider, high-performance tires for better traction and control. Just be sure to keep the overall tire circumference close to stock to avoid throwing off your speedometer.
Want to take things a step further? Lightweight aftermarket wheels not only enhance the look of your car but also help reduce unsprung weight—improving handling, acceleration, and ride quality. It's a win-win: better performance and sharper style.
Fukin Tuned Throttle Response Controller
The cheapest upgrade here, but probably the most bang for the buck one. The Fukin Tuned throttle response controller is the ultimate plug‑and‑play mod that eliminates throttle lag and puts you in complete control of your HEMI 300. It taps into your accelerator pedal position sensor and alters the stock signal to deliver an instant throttle response.
What really sets Fukin Tuned apart is its versatility: it’s fully customizable 36 sensitivity levels across four driving modes—Slow, Cruise, Fast, and Send It—giving you control over everything from smooth city cruising to track‑ready launches. You manage it all right from your phone via Bluetooth—no knobs, no buttons, pure wireless performance tuning. Installation is simple, as all you need is 15 minutes in your garage: Unplug your pedal harness, plug in Fukin Tuned, zip-tie it into place, and link it with the free app.
Best of all, the Fukin Tuned throttle response controller comes with a built-in Anti-Theft feature that lets you disable the gas pedal altogether. Even if someone manages to break into your 300 and somehow cranks the engine, they won’t be able to drive off because the gas pedal won’t work when the Anti-Theft is activated. It is basically a seamless kill switch that protects your ride! Activate the feature after a simple calibration process, and subscribe to one of the very affordable plans to get complete peace of mind. It is FREE to try for the first 14 days, and then it only costs $0.99 a month or $9.99 a year.
Fukin Tuned is the perfect Chrysler 300 SRT-8 upgrade that ties in all the major power mods. No matter how much extra horsepower the Whipple 3-liter supercharger kit delivers, the stock throttle response won’t cut it.