Why Does My 2020 Dodge Challenger Have Exhaust Noise? (Intake Leak Fix)

Here's a guide to address exhaust-related issues in your 2020 Dodge Challenger. From modified exhausts to concerns about warranty and exhaust noise, owners have shared a variety of experiences. As one owner shared, "I want to get tint and exhaust installed eventually. Most likely after the holidays." — Frequent-Answer-7680 [source: https://reddit.com/r/Challenger/comments/1pbtnia/plum_crazy_shaker/] This guide will walk you through potential problems, diagnoses, and solutions based on real owner feedback.

Symptoms

Owners have reported a range of symptoms related to the exhaust system of their vehicles. One common concern is unusual exhaust noise. This can manifest in several ways, from a subtle change in tone to more pronounced sounds like squeaks or a "hemi tick." Identifying the exact nature of the noise is the first step in diagnosing the underlying issue.

Another symptom that some owners have mentioned is anxiety related to potential issues. This anxiety often stems from concerns about warranty coverage, especially when considering modifications to the exhaust system. Owners worry about whether aftermarket parts might void their warranty and whether pre-existing conditions might be covered. "I’m not sure if it’s something to just pay attention to, to see if it worsens or if it’s something to start to take action too. The car is under warranty for 27 more days," one owner noted, highlighting this concern. — Interesting-Win6192 [source: https://reddit.com/r/Challenger/comments/1p8l4jj/quiet_but_noticeable_tapping/]

In some instances, owners have described the exhaust sound as "fake." This can be particularly jarring, especially for enthusiasts who appreciate the authentic sound of a performance vehicle. The perception of artificial exhaust noise can detract from the overall driving experience and may indicate issues with the vehicle's sound enhancement system, if equipped. As one owner described, "Until the dude started it up and it made a fake exhaust noise... I cringed a little." — Accomplished_Crew630 [source: https://reddit.com/r/Challenger/comments/1p5zcti/so_i_thought_this_was_kinda_cool/]

Most Likely Cause

Based on owner reports, a potential cause of exhaust noise or related issues in the 2020 Dodge Challenger is an intake leak. While intake leaks might not directly manifest as exhaust problems, they can indirectly impact exhaust sound. An intake leak can disrupt the air-fuel mixture, causing the engine to run lean or rich. This, in turn, can lead to changes in combustion and exhaust emissions, altering the sound of the exhaust. It's also possible that an intake leak could trigger other engine components to compensate, creating unusual noises that seem to originate from the exhaust system.

How to Diagnose

Diagnosing an intake leak requires a systematic approach. Here’s how you can do it:

1. Visual Inspection: Start by visually inspecting the intake manifold and surrounding components. Look for any obvious cracks, loose connections, or damaged gaskets. Pay close attention to areas where the intake manifold seals against the cylinder head.
2. Listen for Hissing Sounds: With the engine running, listen carefully for any hissing sounds around the intake manifold. A hissing sound can indicate air being sucked in through a leak.
3. Smoke Test: A smoke test is an effective way to locate leaks. You'll need a smoke machine, which can be purchased or rented. Connect the smoke machine to the intake system and introduce smoke. Watch for smoke escaping from any cracks or loose connections. This will pinpoint the location of the leak.
4. Spray Test: With the engine running, spray a small amount of carburetor cleaner or starting fluid around the intake manifold gaskets and vacuum lines. If the engine's RPMs change when you spray a particular area, it indicates a leak in that area. Be cautious when using flammable sprays around a hot engine.
5. Check Vacuum Lines: Inspect all vacuum lines connected to the intake manifold. Look for cracks, breaks, or loose connections. Replace any damaged vacuum lines.
6. Check PCV Valve: While not directly part of the intake manifold, a faulty PCV valve can cause vacuum issues that mimic an intake leak. Inspect the PCV valve and hose for damage or clogs.
7. Scan for Codes: Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the intake system or engine performance. Codes like P0171 (System Too Lean, Bank 1) or P0174 (System Too Lean, Bank 2) can indicate an intake leak.
8. Tools Required:
   • OBD-II scanner
   • Smoke machine (optional)
   • Carburetor cleaner or starting fluid
   • Socket set and wrenches
   • Screwdrivers
   • Inspection light

Step-by-Step Fix

Here’s a step-by-step guide to fixing a potential intake leak on your 2020 Dodge Challenger. Remember to consult a professional if you're not comfortable performing these steps yourself.

1. Gather Tools and Parts: Collect all necessary tools and replacement parts, including new intake manifold gaskets, vacuum lines, and any other parts identified as damaged during the diagnostic process.
2. Disconnect Battery: Disconnect the negative battery terminal to prevent electrical shorts during the repair process.
3. Remove Intake Manifold:
   • Locate and disconnect any electrical connectors and vacuum lines attached to the intake manifold.
   • Remove the throttle body from the intake manifold.
   • Remove any brackets or supports holding the intake manifold in place.
   • Carefully unbolt the intake manifold from the cylinder head.
   • Remove the intake manifold and set it aside.
4. Clean Mating Surfaces: Clean the intake manifold and cylinder head mating surfaces with a gasket scraper or razor blade. Remove any old gasket material and ensure the surfaces are clean and smooth.
5. Install New Gaskets: Install new intake manifold gaskets onto the cylinder head. Make sure the gaskets are properly aligned.
6. Reinstall Intake Manifold:
   • Carefully reinstall the intake manifold onto the cylinder head, aligning it with the new gaskets.
   • Tighten the intake manifold bolts to the manufacturer's specified torque. Use a torque wrench to ensure proper tightening.
7. Reinstall Throttle Body and Vacuum Lines:
   • Reinstall the throttle body onto the intake manifold.
   • Reconnect all electrical connectors and vacuum lines to the intake manifold.
8. Check for Leaks:
   • Start the engine and listen for any hissing sounds around the intake manifold.
   • Use a smoke test or spray test to check for any remaining leaks.
9. Reconnect Battery: Reconnect the negative battery terminal.
10. Clear Codes: Use an OBD-II scanner to clear any diagnostic trouble codes (DTCs) related to the intake system.

As one owner shared: "Try going to another Chrysler dealer to fix the camera under your factory 3yr/36k mile. A modified exhaust will not void the factory warranty on the rest of the car." — deadass_nibba420 [source: https://reddit.com/r/Challenger/comments/1p5ycn9/dealership_lied_or_just_incompetent/nqmlvjn/] This highlights the importance of addressing issues promptly, especially when warranty coverage is still available.

Parts and Tools Needed

Here’s a list of parts and tools you might need for addressing exhaust or intake related issues:

• Intake Manifold Gasket Set: (Part number varies depending on engine type)
• Vacuum Lines: (Assorted sizes)
• Throttle Body Gasket: (If removing the throttle body)
• Carburetor Cleaner or Starting Fluid
• OBD-II Scanner
• Smoke Machine (Optional)
• Socket Set and Wrenches
• Torque Wrench
• Screwdrivers
• Inspection Light

Real Owner Costs

The cost of fixing an intake leak or exhaust-related issue on a 2020 Dodge Challenger can vary significantly depending on the severity of the problem and whether you choose to DIY or go to a professional mechanic.

DIY:

• Parts: Intake manifold gasket set: $30-$70. Vacuum lines: $10-$30. Carburetor cleaner: $5-$10.
• Tools: If you already have basic tools like sockets, wrenches, and screwdrivers, the cost is minimal. However, if you need to purchase a torque wrench or smoke machine, it can add $50-$200 to the cost.
• Total DIY Cost: $45-$300

Professional Mechanic:

• Labor: Labor rates can vary from $75 to $150 per hour. An intake manifold gasket replacement can take 3-5 hours, resulting in labor costs of $225-$750.
• Parts: Parts costs will be similar to DIY, but the mechanic may charge a markup.
• Total Professional Cost: $300-$1000

Prevention

Preventing exhaust or intake related issues in your 2020 Dodge Challenger involves regular maintenance and careful attention to potential warning signs.

1. Regular Inspections: Regularly inspect the exhaust system and intake components for any signs of damage or wear. Look for cracks, loose connections, or corrosion.
2. Proper Maintenance: Follow the manufacturer's recommended maintenance schedule for your vehicle. This includes regular oil changes, air filter replacements, and spark plug replacements.
3. Use Quality Parts: When replacing parts, use high-quality OEM or reputable aftermarket components.
4. Address Issues Promptly: If you notice any unusual noises, changes in engine performance, or warning lights, address the issue promptly. Ignoring small problems can lead to more significant and costly repairs down the road. "So any issues I can take it back and they’ll look into it to fix it. The car has 33k miles on it, I’d assume I shouldn’t run into issues with the motor with it being such a low mileage car," one owner commented, emphasizing the importance of timely action. — Interesting-Win6192 [source: https://reddit.com/r/Challenger/comments/1p8l4jj/quiet_but_noticeable_tapping/]
5. Avoid Extreme Modifications: While modifications can enhance the performance and appearance of your vehicle, avoid extreme modifications that can put undue stress on the engine and exhaust system. As one owner cautions regarding exhaust modifications, "Don't remove the rear resonators, you'll get too much drone with that. If you need more, you can always drop in an exhaust kit, and that'll take some YouTube research or going to some car shows to hear what you like." — flamingmonkey911 [source: https://reddit.com/r/Challenger/comments/1p9dw24/make_it_louder/nrblfvy/] This advice underscores the need for informed decisions when modifying the vehicle.

What Owners Say

Real experiences from DODGE owners:

Success Stories

"They said their paperwork wasn’t legal and can sue them for a good amount . I have tried scaring them and showed up but nothing worked, I’ve had to call on friend’s phones just to get them to pick up." — FirefighterNo4497 (source)

"I have tried scaring them and showed up but nothing worked, I’ve had to call on friend’s phones just to get them to pick up. A complete scam and I’ve regretted the entire thing , but I do have all the part numbers for the parts on my car so will be checking everything and in process of getting evidence ." — FirefighterNo4497 (source)

Owner Experiences

"I want to get tint and exhaust installed eventually. Most likely after the holidays." — Frequent-Answer-7680 (source)

"Until the dude started it up and it made a fake exhaust noise... I cringed a little." — Accomplished_Crew630 (source)

"So I thought this was kinda cool.... Until the dude started it up and it made a fake exhaust noise..." — Accomplished_Crew630 (source)

Lessons Learned

⚠️ "A phone video doesn’t help decide on muffler sound in my opinion . I see you still have the resonators on it aswell ." — eclint85 (source)

Pro Tips from Owners

💡 "You should get some dynamic racebullets welded in place of the mufflers. It will eliminate the rasp you get under heavy acceleration and it deepens the tone of the exhaust." — Tough-Donut193 (source)

FAQ

Q: How long does it take to fix an intake leak?

A: The time to fix an intake leak can vary depending on the severity of the leak and your mechanical skill level. A simple vacuum line replacement might take 30 minutes, while a full intake manifold gasket replacement could take 3-5 hours.

Q: Can I drive with an intake leak?

A: While you can technically drive with an intake leak, it's not recommended. An intake leak can cause poor engine performance, reduced fuel economy, and potential damage to the engine. It's best to address the issue as soon as possible.

Q: Is this a common issue on the 2020 Dodge Challenger?

A: While not the most common issue, intake leaks can occur on any vehicle, including the 2020 Dodge Challenger. Factors such as age, mileage, and environmental conditions can contribute to the development of intake leaks.

Q: DIY vs mechanic - what's recommended?

A: Whether you should DIY or hire a mechanic depends on your mechanical skill level and comfort. If you're comfortable with basic automotive repairs and have the necessary tools, you can save money by doing it yourself. However, if you're not confident in your abilities or the repair is complex, it's best to hire a professional mechanic. Keep in mind that, "A modified exhaust will not void the factory warranty on the rest of the car. As for the exhaust, you may be able to find a take-off oem cat back from marketplace." — deadass_nibba420 [source: https://reddit.com/r/Challenger/comments/1p5ycn9/dealership_lied_or_just_incompetent/nqmlvjn/], so modifications might impact warranty differently than repairs.