Best Exhaust Systems for the Hellcat

On a naturally-aspirated car an exhaust is a power mod; on a supercharged Hellcat it’s mostly a sound mod — and that’s not a knock. The blower already forces the air, so mufflers and tips won’t rewrite the dyno sheet, but they absolutely rewrite the character of a 6.2 supercharged HEMI. The one exception is long-tube headers, which free real flow ahead of the supercharger’s demand on a tuned build. Here’s how to choose an exhaust for a Hellcat, ranked by the decisions that actually matter.

1. Axle-back vs cat-back vs headers — pick your level

This is the first and biggest decision, and it’s about how deep you want to go:

• Axle-back replaces only the mufflers and tips behind the rear axle. It’s the cheapest, easiest bolt-in that changes the tone — an afternoon in the driveway. Best if you mainly want a louder, deeper note.
• Cat-back replaces everything from the catalytic converters back: mid-pipe, X- or H-pipe, mufflers, tips. Fuller change in sound plus a small flow benefit, while keeping the OEM cats (and emissions-legal status).
• Long-tube headers (with a matching mid-pipe) are the real power play. They free flow ahead of the blower and, on a pulley-and-tune car, can be worth a genuine gain — but they demand a tune and often remove or relocate the cats. This is a build-level commitment, not a bolt-on.

Most owners want a cat-back or axle-back for the note; headers belong on a tuned, boost-first build. See where they sit in the order of operations in Best Hellcat Performance Upgrades.

2. Sound character — and the drone question

Exhaust is subjective, but a few design traits predict how a Hellcat will sound:

• X-pipe blends the banks for a smoother, higher-pitched, more exotic tone; H-pipe keeps a lumpier, old-school muscle rumble.
• Resonator-delete / straight-through designs are the loudest and meanest — and the most likely to drone at a steady 70-80 mph cruise.
• Active valve (electronic cut-out) systems cruise quiet and open up under throttle — the best of both worlds if you daily the car.

If you spend real time on the highway, favor a valved or resonated system to kill drone. If it’s a weekend car, a straight-through resonator delete is fine and sounds the part.

3. Materials and build quality

Buy T304 stainless steel for the pipes and, ideally, the tips — it resists rust and heat-bluing far better than the aluminized or T409 stainless used on budget systems. Check the wall thickness and whether the flanges are laser-cut and CNC-mandrel-bent; sloppy bends cost flow and rattle over time. Mandrel-bent T304 with quality band clamps is the durable choice on a car that makes this much heat.

4. Tip size, finish, and fitment

The tips are the only part most people ever see, so match them to the car: 4-inch or 5-inch tips, polished, black chrome, or carbon, and confirm the exit style clears your body’s rear valance. Remember the Challenger and Charger use different rear layouts, so exhausts are body-specific — buy the system listed for your exact car, engine, and year. The same fitment discipline is covered in our Hellcat generations & fitment reference.

5. Cats, codes, and staying legal

Cat-back and axle-back systems leave the factory catalytic converters in place and generally won’t throw a code. Catless or high-flow off-road mid-pipes and header setups can trip the downstream O2 sensors and set a check-engine light unless your tuner squares away the readiness monitors — and they may not be street-legal where you live. If emissions compliance matters, stay cat-back and keep the OEM cats. The FAQ below covers the CEL details.

Where it fits in the build

Exhaust is a character mod first and a power mod only at the header level. The order that makes a Hellcat genuinely faster is boost and tuning first, sound and flow around it:

• Start with power: a tune and a smaller upper pulley — see Best Hellcat Supercharger & Bolt-On Upgrades.
• Support the intake side: Best Cold Air Intakes for the Hellcat.
• Then the exhaust: a cat-back or axle-back for the note, or long-tube headers with a tune if you’re chasing numbers.
• Keep it healthy: don’t forget the maintenance schedule & parts checklist once you’re making more heat.

How to buy

• New systems, clamps, and tips: Amazon Automotive — browse the exhaust category and check current pricing and availability on Amazon.
• Used, take-off, or discontinued systems (Borla ATAK cat-backs, Kooks and ARH long-tubes, factory take-off mufflers, hard-to-find valved setups): eBay Motors, via the search buttons below — used listing prices are shown live.

Buy the exhaust for the sound you actually want to live with, mind the drone if you drive it far, and save the long-tube headers for a tuned, boost-first build where they can finally add real numbers.