Why Are My C8 Corvette Exhaust Tips Sooty or Shaking?

How to Fix Exhaust Tip Issues

Dealing with exhaust tip issues on your 2020 Chevrolet Corvette can be frustrating, but understanding the symptoms and potential solutions can help you address the problem effectively. Based on owner experiences, issues range from soot build-up to the desire for customized exhaust setups. As one owner shared, "I would love to swap them for a quad tip with an electronic baffle so I can have quiet stop and go driving and loud spirited driving (far away from the law and my neighbors)."

Symptoms

Owners of the vehicle have reported a few key symptoms related to exhaust tips. These aren't always indicative of a major problem, but they warrant investigation, especially if you notice a combination of issues. One common observation is the accumulation of soot around the exhaust tips. This black residue can be unsightly and might suggest incomplete combustion or other engine-related concerns.

Another symptom that has been mentioned is the presence of smoke emanating from the exhaust. While some smoke is normal, especially during cold starts, excessive or unusually colored smoke (e.g., blue or white) can indicate more serious problems such as burning oil or coolant. Therefore, it's wise to monitor the color and amount of smoke coming from your exhaust tips.

Shaking or rattling noises related to the exhaust system have also been reported. This could point to loose or damaged exhaust components, including the exhaust tips themselves. Such noises can be particularly noticeable during idle or acceleration, and addressing them promptly can prevent further damage.

Finally, some owners have focused on purely aesthetic issues, such as the appearance of the exhaust tips and their overall integration with the vehicle's design. This often leads to modifications or replacements to achieve a desired look or sound, highlighting the subjective nature of exhaust tip satisfaction.

Most Likely Cause

Based on owner discussions, the primary cause of concern related to exhaust tips on the vehicle appears to be related to mufflers and the desire for customized exhaust setups. While the factory exhaust system is functional, many owners seek to modify it for improved sound, performance, or aesthetics. This often involves replacing the mufflers or exhaust tips. Issues arise when these modifications lead to unwanted side effects like excessive soot, rattling, or simply not achieving the desired sound or appearance. The desire for aftermarket exhaust systems and components drives a significant portion of the exhaust-related discussions among owners.

How to Diagnose

Diagnosing exhaust tip issues on your car involves a combination of visual inspection, auditory assessment, and sometimes specialized tools. Here’s a step-by-step process to help you pinpoint the problem:

1. Visual Inspection: Start by thoroughly inspecting the exhaust tips for any signs of damage, such as cracks, dents, or corrosion. Check for excessive soot build-up around the tips, which could indicate incomplete combustion or exhaust leaks.

2. Check for Leaks: Inspect the connections between the exhaust tips and the rest of the exhaust system. Look for any gaps or signs of exhaust escaping, which could be causing rattling or reduced performance. A smoke machine, as suggested by one owner, can be very helpful here. As Varilux mentioned: "I wish I had purchased the smoke unit earlier to troubleshoot evap issues. The owners manual to the unit I purchased also says you can use it to find exhaust leaks."

3. Assess Muffler Condition: Since the mufflers are a key component affecting the exhaust tips, check them for rust, damage, or signs of internal failure. A failing muffler can cause unusual noises and affect exhaust flow.

4. Listen for Unusual Noises: Start the engine and listen carefully for any unusual noises coming from the exhaust system. Rattling, hissing, or popping sounds can indicate loose components, leaks, or muffler problems.

5. Check Hangers and Mounts: Inspect the exhaust hangers and mounts to ensure they are in good condition and properly supporting the exhaust system. Damaged or missing hangers can cause the exhaust to vibrate and rattle.

6. Consider a Smoke Test: If you suspect an exhaust leak but can't find it visually, consider performing a smoke test. This involves injecting smoke into the exhaust system and looking for smoke escaping from any leaks.

Tools Needed:

• Jack and jack stands
• Gloves and safety glasses
• Flashlight
• Wrench set
• Smoke machine (optional)
• Inspection mirror

Step-by-Step Fix

Addressing exhaust tip issues on the vehicle often involves replacing or modifying exhaust components. Here's a detailed step-by-step guide based on owner experiences:

1. Gather Your Materials: Based on your diagnosis, gather the necessary parts and tools. This might include new exhaust tips, mufflers, hangers, clamps, or welding equipment.

2. Prepare the Vehicle: Safely lift the vehicle using a jack and secure it with jack stands. Make sure the vehicle is stable before proceeding.

3. Remove Old Exhaust Tips (If Applicable): If you're replacing the exhaust tips, loosen any clamps or bolts securing them to the exhaust system. Carefully remove the old tips, taking note of how they were attached. As one owner mentioned about loosening a stubborn part, "_zebra" shared: "So out came the channel locks, that did the trick. if swinging my purse harder don't work, an oil filter wrench will."

4. Inspect the Exhaust System: Before installing new parts, thoroughly inspect the rest of the exhaust system for any signs of damage or corrosion. Address any issues you find to ensure the longevity of your repair.

5. Install New Exhaust Tips: Attach the new exhaust tips to the exhaust system using the appropriate clamps or bolts. Make sure they are securely fastened and properly aligned.

6. Replace Mufflers (If Necessary): If you're replacing the mufflers, disconnect the old mufflers from the exhaust system. Install the new mufflers, ensuring they are properly aligned and securely connected. Mr. Black had this to say: "That is an option for sure but ultimately I still have more than enough room to just keep shortening the rod portion of the hangers. That being said, these mufflers are only temporary so I am not going to get gung ho trying to make it perfect just to start all over again."

7. Check Exhaust Hangers: Inspect the exhaust hangers and replace any that are damaged or worn. Ensure the exhaust system is properly supported to prevent rattling or vibration.

8. Test for Leaks: Start the engine and listen carefully for any exhaust leaks. If you hear any leaks, tighten the clamps or bolts until the leaks are sealed.

9. Lower the Vehicle: Once you're satisfied with the repair, carefully lower the vehicle to the ground.

10. Final Inspection: Take the vehicle for a test drive and listen for any unusual noises or vibrations. Make any necessary adjustments to ensure the exhaust system is functioning properly.

Parts and Tools Needed

• Exhaust Tips: Aftermarket exhaust tips with desired style and size (various brands and sizes available)
• Mufflers: Performance mufflers for enhanced sound (brands like Borla, MagnaFlow)
• Exhaust Clamps: Stainless steel exhaust clamps (various sizes depending on pipe diameter)
• Exhaust Hangers: Universal exhaust hangers (various lengths and styles)
• Welding Equipment: MIG or TIG welder (for custom exhaust modifications)
• Wrench Set: Metric wrench set (sizes typically ranging from 10mm to 19mm)
• Socket Set: Metric socket set (sizes typically ranging from 10mm to 19mm)
• Jack and Jack Stands: For safely lifting and supporting the vehicle
• Penetrating Oil: To loosen rusted bolts and clamps
• Hacksaw or Exhaust Cutter: For cutting exhaust pipes

Real Owner Costs

The costs associated with addressing exhaust tip issues on the vehicle can vary widely depending on the specific problem and whether you choose to do the work yourself or hire a professional. Here are some real-world examples based on owner reports:

• DIY Exhaust Tip Replacement: Purchasing aftermarket exhaust tips can range from $50 to $200, depending on the brand and style. The cost of tools (if needed) can add another $50 to $100. Total DIY cost: $100 - $300.

• Professional Exhaust Tip Installation: Hiring a shop to install aftermarket exhaust tips can cost between $100 and $300 in labor, plus the cost of the tips themselves. Total cost: $150 - $500.

• DIY Muffler Replacement: Performance mufflers can range from $100 to $500 each. Additional costs may include clamps, hangers, and welding supplies. Total DIY cost: $200 - $1000. As MSG C5 mentioned: "I always try to sell here on the Forum first, but more often I sell the parts either locally or on the auction site. Just so many scams to watch out for on the social sites."

• Professional Muffler Replacement: Hiring a shop to replace mufflers can cost between $200 and $500 in labor, plus the cost of the mufflers and any additional parts. Total cost: $400 - $1500.

Prevention

Preventing exhaust tip issues on your car involves regular maintenance and careful attention to the exhaust system. Here are some tips to help you avoid problems in the future:

• Regular Inspections: Periodically inspect the exhaust tips, mufflers, and hangers for any signs of damage or corrosion. Address any issues promptly to prevent further damage.

• Proper Maintenance: Follow the manufacturer's recommended maintenance schedule for your vehicle, including regular oil changes and tune-ups. This can help prevent issues that can lead to excessive soot build-up.

• Avoid Harsh Driving Conditions: Avoid driving in conditions that can damage the exhaust system, such as off-roading or driving over speed bumps too quickly.

• Use Quality Parts: When replacing exhaust components, use high-quality parts that are designed to withstand the rigors of daily driving.

• Proper Installation: Ensure that any exhaust modifications or replacements are performed by a qualified professional to prevent leaks or other problems.

What Owners Say

Real experiences from CHEVROLET owners:

Success Stories

"Quote: Originally Posted by knewblewkorvette Even after hitting it with my purse , I still couldn't get my 98's cap to loosen. So out came the channel locks, that did the trick. if swinging my purse harder don't work, an oil filter wrench will Quote: Originally Posted by Kubs I washed it today." — _zebra (source)

"So out came the channel locks, that did the trick. if swinging my purse harder don't work, an oil filter wrench will Quote: Originally Posted by Kubs I washed it today." — _zebra (source)

Owner Experiences

"Turns out after repeated order mishaps I have three of the RPI rear plate covers now. Electron blue, painted/cleared black, and out of nowhere long after the order issues were resolved a third one showed up this weekend which is a flat black." — Tusc (source)

"Had a bad solenoid, so i replaced the whole starter... Kind of a suck job...rusty terminal posts made removing wires difficult...plus typical exhaust removal issues... old starter Quick Jack set up" — 99vette9999 (source)

"Thus far I enjoy the quiet ride when cruising which is all I have done a single short shakedown ride. I need to secure a brake line in the pass rear side of the cradle I think, which I am about to chase down, and then the car is back to solid." — Tusc (source)

Lessons Learned

⚠️ "I wish I had purchased the smoke unit earlier to troubleshoot evap issues. The owners manual to the unit I purchased also says you can use it to find exhaust leaks." — Varilux (source)

⚠️ "I always try to sell here on the Forum first, but more often I sell the parts either locally or on the auction site. Just so many scams to watch out for on the social sites." — MSG C5 (source)

⚠️ "That is an option for sure but ultimately I still have more than enough room to just keep shortening the rod portion of the hangers. That being said, these mufflers are only temporary so I am not going to get gung ho trying to make it perfect just to start all over again." — Mr. Black (source)

Pro Tips from Owners

💡 "They look very similar to motorcycle exhausts. I would love to swap them for a quad tip with an electronic baffle so I can have quiet stop and go driving and loud spirited driving (far away from the law and my neighbors)." — Swollgineer (source)

💡 "I would love to swap them for a quad tip with an electronic baffle so I can have quiet stop and go driving and loud spirited driving (far away from the law and my neighbors)." — Swollgineer (source)

Real Repair Costs

"For now, it's looking like a very well spent $100. Here's a link to the particular device I purchased- it's pretty simple to operate and comes with everything you need (whoops, looks like it was a little more than 100- still a good buy IMO at $129- I went for the version with a built in air pump). https://www.amazon.com/dp/B0B2JV8YDP?psc=1&ref=ppx_yo2ov_dt_b_product_details https://www.amazon.com/dp/B0B2JV8YDP?psc=1&ref=ppx_yo2ov_dt_b_product_details" — Varilux (source)

FAQ

Q: How long does it take to fix exhaust tip issues?

A: Replacing exhaust tips can take anywhere from 30 minutes to a few hours, depending on the complexity of the installation and your experience level. Replacing mufflers can take longer, typically ranging from 2 to 4 hours.

Q: Can I drive with damaged exhaust tips?

A: Driving with damaged exhaust tips is generally safe, but it can lead to further damage to the exhaust system and may affect performance. It's best to address any issues promptly.

Q: Is this a common issue on the vehicle?

A: While not necessarily a common issue, exhaust modifications and replacements are popular among vehicle owners who are looking to customize their car's sound and appearance.

Q: DIY vs mechanic – what's recommended?

A: Replacing exhaust tips is a relatively straightforward task that many owners can do themselves. However, replacing mufflers or performing more complex exhaust modifications may require specialized tools and expertise, in which case hiring a professional is recommended.