Best Mods for a Stock 6.2 Hellcat / Trackhawk / TRX: A Beginner's Guide

Why Mod Order Matters

You bought a Hellcat-family vehicle for a reason—and the aftermarket makes it easy to go too far, too fast. Pulley swaps, E85, and big boost are real paths. They are not where most owners should start. On a stock 6.2L supercharged HEMI, the order you install support mods matters if you want consistency, drivability, and power you can actually use.

Unlike a naturally aspirated 5.7 or 6.4, your 6.2 already force-feeds air with a factory blower. That changes the beginner playbook: cold air and exhaust still matter, but spark (especially colder plugs), heat management, and airflow into the supercharger become the foundation before you chase pulley diameter.

The Bottleneck Principle

The blower can only compress what the intake and throttle body deliver—and the engine can only make clean power if spark and exhaust keep up under boost.

• Intake without ignition support: More airflow into a hot, high-cylinder-pressure environment that still runs stock heat-range plugs
• Exhaust for sound only: Great cabin experience, limited power if the inlet side and spark are still stock
• Throttle body without a proper intake path: A larger bore helps most when the airbox/filter side is already opened up

Build a balanced support package first. Our Power Kit Builder is designed for that—select your year, make, model, and 6.2L engine, then assemble intake, throttle body, exhaust, coils, and spark plugs from parts we've already curated for fitment.

Setting Realistic Expectations

On a healthy stock-blower 6.2L, a well-chosen intake, cat-back, modest throttle-body bump, colder plugs, and performance coils typically nets roughly 40–80 rear-wheel horsepower of combined improvement—plus sharper response and far better spark security under boost. That is meaningful on a platform that already starts north of 700 crank horsepower, without opening the blower or cutting a pulley yet.

aFe and other brands often advertise 25–40 HP on Hellcat intakes alone because the supercharger multiplies airflow improvements. Treat those as manufacturer-rated upside numbers; street results vary with heat soak, altitude, fuel, and tune state.

Stage 1: Intake & Throttle Body

The factory Hellcat-family airbox is decent for OEM goals. It is not optimized for maximum blower inlet flow or intake sound. That is why a platform-correct cold air intake is still the best first hardware mod for most 6.2 owners: it feeds the supercharger better, improves throttle response, and makes the car sound as serious as it is.

Cold Air Intakes: Feed the Blower

On a supercharged 6.2, intake upgrades matter more than on many NA HEMIs because you are improving the air supply before the compressor. Cooler, less-restrictive inlet air helps power and consistency—especially on Trackhawk, Durango Hellcat, and TRX vehicles that heat-soak hard in traffic or after trail/street abuse.

Expect roughly 20–40 horsepower from a well-designed Hellcat/TRX/Trackhawk intake in manufacturer testing, with throttle response and blower whine you will notice immediately. Year and body style matter—2015–2016 Hellcat intakes are not the same as 2017–2023 kits, and Jeep/Ram packages are unique.

When shopping, look for:

• Exact platform fitment: Challenger/Charger Hellcat, Trackhawk, Durango Hellcat, and TRX do not share one universal kit
• Sealed or shielded housing: Keeps hot underhood air out of the blower inlet
• High-flow filtration: Pro Dry S / Pro 5R style media matched to your dust and maintenance preferences
• Correct sensor fitment: Critical on these drive-by-wire, heavily computer-managed engines

Recommended Intake Upgrades

For 2015–2016 Challenger / Charger Hellcat, use the generation-correct aFe Momentum Magnum Force Stage-2 (rated up to about 39 horsepower in this application). For 2017–2023 Hellcat cars, step to the aFe Momentum GT or the more aggressive aFe Magnum Force Stage-2 (~25–37 HP claimed depending on kit).

Trackhawk and Durango Hellcat owners should look at the aFe Track Series Carbon Fiber Cold Air Intake—a premium sealed setup for 2019–2021 Trackhawk and 2021–2026 Durango 6.2L applications (earlier 2018 Trackhawk has its own Track Series Pro 5R kit).

Ram TRX (2021–2024) owners can choose the aFe Momentum GT (~28 HP claimed) or the Magnum Force Stage-2 for a more open-element approach. Limited color editions exist if you want the bay to match the TRX attitude.

Not sure which intake fits your exact year and model? Start in the Power Kit Builder—it only shows intakes that match the vehicle you select.

Throttle Body Upgrades

Stock Hellcat-family throttle bodies measure 92mm. That is already large compared with NA HEMIs—but it is still a restriction once you improve inlet flow and start supporting more boost later.

A modest step to a 95mm throttle body improves airflow capacity and tip-in without requiring the bigger 105mm-class upgrades that usually want a full tune/pulley plan. Expect about 8–15 horsepower plus cleaner response on a stock-blower car, with gains that grow as intake, exhaust, and eventually tuning come online.

Our primary recommendation from the current catalog is the Granatelli 95mm Throttle Body (Satin)—a real size increase over the OEM 92mm Hellcat unit and a sensible beginner bump for Hellcat / Trackhawk / related 6.2 applications. The BTR 92mm matches stock diameter; treat it as a value/response-oriented option rather than a bore upgrade.

Installation Difficulty: Easy to Moderate

Hellcat intakes are still DIY-friendly for most owners—usually 1–2 hours depending on platform and engine-cover complexity. TRX and Trackhawk bays can be tighter; budget patience. Throttle body swaps remain straightforward with basic tools and careful connector handling.

Stage 2: Ignition Upgrades

If you only steal one section from this guide, steal this one. The 6.2L Hellcat-family engine is a dual-plug, high-cylinder-pressure supercharged HEMI. Stock heat-range plugs that are old—or the wrong heat range for added airflow—are one of the fastest ways to get misfires, break-up at high RPM, or worse under boost.

One-Step Colder Spark Plugs (Required Thinking)

For 6.2 Hellcat / Trackhawk / TRX builds, we recommend a full NGK 1-Step Colder Spark Plug Set (16 plugs). These are engineered for high-performance and supercharged HEMI applications and come as a complete dual-plug set—no guessing quantities.

Colder plugs shed heat better in boosted combustion chambers. On a stock blower with bolt-ons—and especially before any future pulley/tune—they are cheap insurance and a real performance enabler. Gap to your tuner or OEM-spec guidance for your exact calibration, and replace them as a maintenance item more often than you would on a grocery-getter 5.7.

In the Power Kit Builder, spark plugs are pre-selected for your vehicle with the correct quantity already set.

Performance Coil Packs

Each cylinder uses a coil-on-plug unit feeding the dual-plug layout. Factory coils are adequate when new, but heat, mileage, and boost demand take a toll. Performance coils raise spark energy for a more complete burn and better high-RPM security.

RIPP HEMI High Performance Coil Packs are our staff-pick recommendation across Hellcat-family 6.2 applications (and the broader Gen III HEMI line). Prefer an MSD dual-plug-focused package? The MSD Blaster HVC 8-Pack is a premium alternative built for these engines.

Product ratings run as high as about 30 horsepower. In the real world, treat coils as critical support hardware: the biggest wins come when fresher, higher-output coils are paired with the correct colder plugs—especially once the intake is feeding the blower harder.

Installation Difficulty: Moderate

Sixteen plugs on a supercharged HEMI takes time—engine covers, coil boots, and tight access on some Jeep/Ram packages. Label everything, use the correct socket/extensions, and torque carefully into aluminum heads. Coil swaps are easier once you are already in there for plugs—do them together.

Stage 3: Exhaust Upgrades

Hellcat-family cars already sound serious. A quality cat-back still transforms the experience—louder, deeper, and usually a bit freer-breathing—while staying emissions-sensible if you keep the catalytic converters. On these platforms, expect meaningful tone plus roughly 10–25 horsepower from a well-designed cat-back, with exact numbers depending on muffler design and whether resonators are retained.

Cat-Back Exhaust: Sound With Purpose

A cat-back replaces everything from the cats rearward. It is the right first exhaust upgrade for street Hellcats, Trackhawks, Durango Hellcats, and TRXs: weekend-installable for many systems, 50-state friendly with cats retained, and immediately addictive.

When choosing a system:

• Aggressive / track-leaning: AWE Track Edition or aFe MACH Force-Xp no-muffler / no-resonator styles
• Loud but livable: Borla ATAK or S-Type (Durango Hellcat options in catalog)
• TRX daily/off-road manners: AWE 0FG with drone-canceling 180 Technology

Recommended Exhaust Upgrades

For Charger Hellcat / Redeye-era 6.2 (and matching 6.4 cars in the same shell), the AWE Track Edition Cat-Back is a staff-favorite aggressive system. Prefer an aFe no-muffler approach? The aFe MACH Force-Xp Cat-Back (no muffler) covers 2015–2023 Charger 6.2 / 6.4 applications with a rawer tone.

Durango Hellcat (2021–2026) owners can choose personality: Borla ATAK for maximum aggression (reuses OEM tips) or Borla S-Type with black tips for a slightly more refined sport tone—both developed around the supercharged 6.2.

Trackhawk owners have a strong Jeep-specific option in the aFe MACH Force Cat-Back (without resonators) for 2012–2021 Grand Cherokee 6.4 / 6.2 applications.

Ram TRX (2021–2024) pairs exceptionally well with the AWE 0FG Cat-Back (polished or black tips)—dual 3" T304L stainless with resonated H-pipe and AWE’s drone-canceling design for a truck that still has to live on the highway.

Prefer to filter by vehicle first? The Power Kit Builder shows cat-backs and headers that fit your selection—add one, or skip exhaust if you are building in stages.

What to Expect: Sound and Power

A good cat-back does not turn a Hellcat into a different species—it reveals the one you already bought. Blower whine up front, HEMI thunder out back, and a little less restriction in between. Power gains are real but secondary to the intake/ignition foundation on a stock blower; sound and throttle feel are immediate.

Installation Difficulty: Moderate

Most cat-backs are a solid weekend project with a lift or careful jack stands. Budget 2–5 hours the first time—AWD Trackhawk / Durango / TRX packaging can add complexity versus a RWD Challenger/Charger. Full header systems are advanced; save them for after the beginner package.

The Smart Upgrade Path

Here is the practical roadmap for a stock-blower 6.2L—Hellcat, Trackhawk, Durango Hellcat, or TRX—before you touch pulley diameter.

The Recommended Order

1. Cold Air Intake — Feed the blower; immediate sound and response
2. NGK 1-Step Colder Plugs (×16) + Coil Packs — Secure spark under boost before you ask for more
3. Cat-Back Exhaust — Tone + flow; keep the cats for the street
4. 95mm Throttle Body — Modest bore bump over the stock 92mm; best before a future tune
5. Tune / pulley (next chapter) — Where the really big 6.2 power jumps live

This order prioritizes reliability and consistency on a supercharged engine. Want the short path for the hardware categories in this guide? Build intake, throttle body, exhaust, coils, and plugs in one place with the FastHemis Power Kit Builder—keep what you want, skip what you don't, and check out a matched kit for your 6.2L.

Realistic Expectations: What You'll Gain

Stock outputs vary by badge—TRX ~702 HP, classic Hellcat / Trackhawk ~707 HP, later Hellcats ~717 HP, with Redeye/Demon much higher. After drivetrain loss, wheel numbers depend heavily on AWD vs RWD. For a stock-blower beginner package, plan around:

That is a realistic ~40–80 rear-wheel horsepower class support package before pulley work—plus the consistency and spark security that let you enjoy the car you already paid Hellcat money for. Heat soak on Trackhawk / Durango / TRX can shrink seat-of-the-pants gains on back-to-back pulls; cooler inlet temps from a quality CAI help there too.

Common Mistakes to Avoid

• Skipping colder plugs: The most expensive “cheap” mistake on a 6.2
• Buying the wrong year Hellcat intake: 2015–2016 and 2017–2023 kits are not interchangeable
• Installing a smaller NA throttle body: Stock Hellcat TB is 92mm—do not step backward
• Chasing pulley power before support mods: Airflow and ignition first, then boost
• Expecting cat-back alone to transform ET: Exhaust is fantastic for sound; intake + spark move the needle for stock-blower performance

What Comes Next?

After the beginner support package, the Hellcat playbook opens up:

• Upper pulley + custom tune: The classic path into the mid/high 700s+ WHP on pump gas (application-dependent)
• Fuel system / E85 calibrations: For owners ready to support bigger boost
• Headers / full race exhaust: Advanced flow for serious power goals
• Blower porting / larger superchargers: Endgame territory—not a beginner step

You do not have to go there. A correct intake, colder plugs, coils, cat-back, and 95mm throttle body create a sharper, louder, more consistent Hellcat-family vehicle that still behaves like a street car.

Final Thoughts

Modifying a stock 6.2L Hellcat, Trackhawk, Durango Hellcat, or TRX is not the same as bolting parts onto a 5.7. The staged approach in this guide—feed the blower, secure the spark, free the exhaust, then bump the throttle body—is the smartest way to add power and confidence without skipping the fundamentals.

By following the smart upgrade path, you'll:

• Pick up a realistic 40–80+ rear-wheel horsepower class support improvement from proven bolt-ons
• Protect a supercharged HEMI with 1-step colder plugs and stronger coils
• Match parts to the correct Hellcat / Trackhawk / TRX generation
• Build a clean foundation before pulley and fuel-system decisions

These 6.2L platforms reward thoughtful support mods. Get the airflow and ignition right first, and every later upgrade—tune, pulley, or otherwise—starts from a healthier baseline.

Ready to start your build? Open the FastHemis Power Kit Builder, select your year, make, model, and 6.2L engine, and assemble a curated intake, throttle body, exhaust, coil, and spark plug package in one pass.