Upgrading your Dodge Challenger Redeye with a custom exhaust system is one of the most rewarding modifications you can make—especially if you live in Nashville, where the car scene runs deep and the sound of a big Hemi is part of the culture. This guide covers everything you need to know, from choosing the right setup to the final bolt check, with local insights that matter in Music City.

Why Your Challenger Redeye Deserves a Custom Exhaust

The Hellcat Redeye’s supercharged 6.2-liter Hemi is already a masterpiece of power, but the factory exhaust system is a compromise. It’s designed to meet noise regulations, reduce weight, and keep production costs low. A custom exhaust unleashes the engine’s true voice and potential.

Performance Gains That Matter

Replacing the restrictive factory mufflers and piping with a larger, free-flowing system reduces backpressure. The result is a measurable increase in horsepower and torque, typically 10–20 hp on a supercharged engine like the Redeye with a cat-back system, and more with headers and a full setup. Improved exhaust flow also helps the engine breathe more efficiently, which can lead to better throttle response and, when combined with a tune, even higher gains.

Sound Personalization

Nashville is known for music, and your Challenger can be part of the symphony. A custom exhaust gives you control over the decibel level and tone. Options range from a deep, rumbling idle to an ear-splitting WOT scream. Whether you want a refined daily-driver note or a track-ready roar, the right components make it possible.

Weight Reduction and Aesthetics

Many aftermarket exhaust systems use lighter materials like 304 stainless steel or titanium, shedding pounds from the rear of the car. Custom tips also let you personalize the look—from polished double-wall tips to matte black or carbon fiber finishes.

Before you start cutting and clamping, understand the rules. Tennessee does not require emissions testing for most counties, including Davidson County (Nashville). That means you likely won’t face a visual inspection of your catalytic converters. However, removing catalytic converters is illegal under federal law and can result in fines. Most aftermarket cat-back systems keep the cats intact; if you’re looking for a full turbo-back or long-tube headers, you’ll need a high-flow catted system to stay street-legal.

Noise ordinances vary by city. Nashville’s municipal code prohibits “excessive” noise from vehicles, typically measured at a distance. A straight-piped Redeye will almost certainly attract attention—and possibly a citation. Choose a system with resonators or mufflers that keep sound levels reasonable for daily driving. If you plan to track your car, many tracks have their own decibel limits (often 95–100 dB).

Choosing the Right Custom Exhaust System

Materials: Stainless vs. Aluminized vs. Titanium

  • 304 Stainless Steel – Most common for performance exhausts. Rust-resistant, durable, and can be polished to a mirror finish. Higher cost but lasts the life of the car.
  • 409 Stainless Steel – Magnetic and less shiny, but still corrosion-resistant. Often used in OEM-like systems; more affordable.
  • Aluminized Steel – Budget-friendly but prone to rust in wet climates. Not ideal for Nashville’s humidity.
  • Titanium – Ultralight and exotic, with a distinct blueish tint and unique sound. Extremely expensive.

Muffler and Resonator Design

  • Chambered Mufflers (e.g., Flowmaster) – Give a classic muscle car rumble. Medium drone.
  • Straight-Through Mufflers (e.g., Borla ATAK, Corsa Xtreme) – Maximum flow, loud, with aggressive WOT sound. Some have tuning chambers to reduce drone.
  • MagnaFlow Straight-Through – Louder but deeper than factory; good balance.
  • Resonator Delete – Common mod to increase volume without replacing mufflers, but can cause drone.

Pipe Diameter and Configuration

The 2015+ Challenger Redeye benefits from 3-inch or 3.5-inch mandrel-bent tubing. Keep dual 2.5-inch on stock power; bump to 3-inch if you plan on forced induction upgrades. Avoid sharp bends—mandrel bends maintain inside diameter for smooth flow.

Brands to Consider

Some top-tier manufacturers include Corsa Performance (known for drone-canceling technology), Borla (great sound and build quality), MagnaFlow, and AWE Tuning. For a custom-fabricated system, reputable local shops can weld up a one-off design using high-quality components.

Tools and Prep Work

A successful installation starts with the right tools and a safe workspace. Many DIYers in Nashville use a garage or a friend’s lift, but jack stands work fine if you follow safety procedures.

Essential Tools

  • 3-ton floor jack and two (or four) jack stands
  • Metric socket set: 10mm, 13mm, 15mm, 18mm, 21mm
  • Standard and deep sockets, ratchets, extensions
  • Breaker bar (for stubborn bolts)
  • Penetrating oil (WD-40 Specialist or PB Blaster)
  • Exhaust pipe cutter or reciprocating saw with metal blade
  • Wire brush and sandpaper
  • Torque wrench (for final tightening)
  • Safety glasses, gloves, and ear protection

Parts Checklist

  • Full cat-back or axle-back exhaust kit (includes pipes, mufflers, clamps, gaskets)
  • New exhaust hangers (rubber isolators often needed)
  • High-temp anti-seize compound
  • Heat wrap or ceramic coating (optional, for underhood pipes)
  • O2 sensor socket if removing cats or downpipes

Prep Steps

Park on a level surface, let the exhaust cool completely, then apply penetrating oil to all clamp bolts, hangar rods, and flange nuts. Let it soak for 15–30 minutes before attempting removal. Disconnect the negative battery terminal if you plan to disconnect any sensors.

Step-by-Step Installation: Custom Exhaust on a Challenger Redeye

1. Safely Lift the Vehicle

Place the jack under the rear differential—not the exhaust or suspension—and lift until the tires just clear the ground. Set jack stands under the factory pinch welds (the reinforced points). Lower the car onto the stands. For extra safety, chock the front wheels.

2. Remove the Stock Exhaust

Start at the rear and work forward. Disconnect the muffler clamps or hangers. You may need to unbolt the rear bumper trim to free the tips. Spray more penetrating oil on stuck hardware. Use the breaker bar carefully to avoid stripping. If bolts snap, drill them out with a left-hand bit. Slide each section down and out—have a friend help if the system is long. For the mid-pipe, you may need to remove a heat shield near the driveshaft.

3. Prepare the New System

Lay out all parts on a clean surface. Compare the new exhaust to the old one to confirm fitment. Slide the pipes together loosely using the supplied clamps. Do not fully tighten anything yet—you need the ability to adjust alignment and clearances.

4. Install from Front to Back

Begin at the catalytic converter (or headers) and work rearward. Use new gaskets at each flange connection. For ball-and-socket joints, tighten just enough to hold. Hang the system loosely in the factory rubber isolators. On the Redeye, pay attention to the rear axle clearance—some 3.5-inch pipes may need slight clearance modification.

5. Align and Tighten

With all hangers hooked, move the system to ensure no contact with the body, frame, or heat shields. Leave 1/2 inch of clearance around any plastic components. Once alignment is perfect, tighten all clamps to the spec listed in the instructions (typically 30–40 ft-lbs on slip joints, 20 ft-lbs on flanges). Apply anti-seize to threads to prevent future seizure.

6. Reinstall Heat Shields and Trim

If you removed heat shields (common near the fuel tank), reinstall them to prevent heat soak. Carefully refit the rear bumper trim around the new exhaust tips. Clean the tips with alcohol before final position adjustment.

7. Leak Test and Final Inspection

Start the engine and let it idle. Use a rag or your hand (careful of heat) to feel for puffs of exhaust at each joint. You can also spray soapy water around clamps—bubbles indicate a leak. Tighten as needed. Listen for rattles or metallic contact. Drive the car slowly and turn the wheel lock to lock to check clearance near the rear suspension.

8. ECU Reset and Drive Cycle

After installation, performing an ECU reset (disconnect battery for 15 minutes) can help the engine relearn its air-fuel trims with the new exhaust flow. Drive normally for 20–30 miles; the Check Engine Light should not come on unless you removed O2 sensors or cats. If you installed headers or a full turbo-back, a custom tune is strongly recommended.

Post-Installation Tuning and Performance

For maximum power, especially with larger diameter piping or headers, a custom dyno tune is the best investment. Local shops in Nashville can load a tune via PCM unlock or use a handheld tuner like HP Tuners or DiabloSport. Expect gains of 15–30 hp on top of the exhaust alone when the engine is properly calibrated. Be aware that tuning may void your factory powertrain warranty.

Maintenance and Longevity

  • Clean the tips regularly with a non-abrasive polish to prevent corrosion.
  • Re-torque clamps after the first heat cycle (500 miles).
  • Inspect hangers every oil change—heat and vibration can crack rubber.
  • If you drive in winter salt, consider a stainless system or apply high-temp paint to raw steel sections.

Local Resources in Nashville

Whether you’re planning a DIY install or want professional help, Nashville has several shops that specialize in high-performance exhaust on Mopars:

  • Speed Factory Nashville – Dyno tuning and custom exhaust fabrication; highly rated for Hellcat/Redeye work.
  • Xtreme Performance – Full exhaust installs and DynoJet tuning.
  • Muffler Man – Quick and affordable custom bends, though quality varies; good for basic cat-back change.
  • Custom Street Exhaust – Local hot rod shop that can mandrel-bend on-site; ideal for one-off designs.

Visit Speed Factory Nashville for professional installation and tuning packages.

Final Thoughts

Installing a custom exhaust on your Challenger Redeye in Nashville is more than a weekend project—it’s a transformation. You’ll gain performance, a head-turning sound, and a deeper connection with your car. Whether you choose a bolt-on cat-back from a major brand or have a shop tig-weld a titanium masterpiece, the key is precision, patience, and safety. Enjoy the rumble through the streets of Music City, and respect the neighbors—a Redeye on a cold start is a beautiful thing, but nobody likes a 6 a.m. drone.