Nashville, Tennessee, has rapidly evolved into a thriving hub for automotive enthusiasts, particularly those passionate about high-performance cars. From souped-up Mustangs cruising Broadway to turbocharged Subarus carving through the hills, Music City's car scene is as lively as its music. Among the latest modifications gaining traction is the catch can—a simple yet highly effective device that helps improve engine health, reduce maintenance, and preserve performance. Local owners are reporting real-world gains, and their success stories are spreading fast.

What Exactly Is a Catch Can?

At its core, a catch can is a small reservoir installed in the crankcase ventilation system of a vehicle. In modern engines, the positive crankcase ventilation (PCV) system routes blow-by gases—a mixture of combustion byproducts, oil vapors, and moisture—back into the intake manifold to be re-burned. While this reduces emissions, it also allows oil mist to coat intake valves, intercooler passages, and throttle bodies, leading to carbon buildup over time.

A catch can intercepts these vapors before they reach the intake. Inside the can, the vapors cool, condense, and separate. Oil and moisture collect in the bottom, while cleaned air is allowed to pass back into the intake system. The result is a cleaner engine, better combustion, and fewer deposits. It's a low-cost preventative measure that has become essential for direct-injection engines, which lack the cleaning effect of fuel washing over the valves.

Why Nashville Performance Car Owners Are Embracing Catch Cans

Nashville's car community is tight-knit and well-informed. Regular meetups, track days, and shows like the Music City Raceway events foster an environment where mods are shared and tested. The region's humid, variable climate also plays a role—moisture in the crankcase can accelerate sludge formation, making an effective oil separator even more valuable.

Catch cans are affordable (typically $100–$400), easy to install, and offer immediate, measurable benefits. Many Nashville owners have documented their experiences, and their stories provide compelling evidence of the device's value.

John D. – 2019 Ford Mustang GT

“Smoother idle, sharper throttle response, and less carbon during every inspection.” John, a regular at the Nashville Cars & Coffee, installed a dual-catch-can setup on his Coyote-powered Mustang. He reports that after 20,000 miles, the intake valves looked nearly as clean as when the engine was new. “Before the catch can, I’d see black sooty deposits by 10,000 miles. Now it’s night and day.”

Lisa M. – 2021 Subaru WRX

“Oil consumption dropped, and my fuel economy went up by almost two miles per gallon.” Lisa’s turbocharged WRX was drinking a quart of oil every 1,500 miles—common in direct-injection turbo engines. After installing a baffled catch can, consumption stabilized to an expected level. She also noticed the engine felt less “gummy” under hard acceleration. Lisa now recommends catch cans to every Subaru owner she meets at the Nashville Subaru Club meetups.

Mike R. – 2020 Chevrolet Camaro SS

“I stopped chasing phantom knock, and the dyno showed a solid 8 horsepower gain after the can was installed.” Mike, an avid drag racer, was frustrated by intermittent knock retard on his LT1-powered Camaro. After installing a vented catch can with a check valve, the knock disappeared. He believes the reduction in oil vapor contamination allowed the knock sensors to read more accurately. “The car just runs cleaner. I’m not saying it’s a magic power adder, but it let the engine perform the way it was designed to.”

David S. – 2018 BMW M3 (Competition)

“My valves were getting coked up by 30,000 miles. With a catch can, the walnut blasting interval is now easily double that.” David, an enthusiast active in the Nashville Euro Car Club, installed a dedicated oil-air separator on his S55 engine. He tracks the car at the NCM Motorsports Park and noticed that after two seasons with the catch can, the upper intake and throttle body were much cleaner. He estimates saving over $600 in future carbon cleaning costs.

Rachel T. – 2017 Ford Focus RS

“I was getting a lot of oil mist around the intake after hard pulls. The catch can stopped that entirely, and the engine idles smoothly now.” Rachel’s Focus RS sees daily duty plus autocross. She chose a compact, dual-inlet catch can that fits neatly in the engine bay. She also appreciated how easy it was to drain—she empties it every 2,000 miles and says it captures about four ounces of dark, smelly fluid. “It’s gross, but knowing that sludge isn’t going into my engine is peace of mind.”

Chris H. – 2016 Dodge Challenger Hellcat

“On a supercharged engine, blow-by is even worse. My catch can fills up quickly, but it keeps the intercooler and throttle body spotless.” Chris is a regular at the Spring Car Show in Franklin. He notes that with the Hellcat’s high boost, the PCV system pushes a lot of oil mist. After installing a large-capacity catch can, he was shocked to see how much oil it trapped—about six ounces between oil changes. “I’d rather empty a can than pay for a new intercooler.”

How Catch Cans Improve Engine Health in Detail

Reducing Carbon Buildup on Intake Valves

Direct-injection engines (GDI) are especially prone to carbon deposits because fuel never touches the intake valves. Oil vapors from the crankcase bake onto hot valve stems, forming hard carbon crusts that disrupt airflow, reduce compression, and cause misfires. A catch can intercepts those vapors, dramatically slowing buildup. Many Nashville owners of cars like the Genesis G70, Honda Civic Type R, and Volkswagen GTI have reported success.

Preventing Oil Contamination in Intercoolers and Air Intakes

In turbocharged and supercharged cars, oil vapor can coat the intercooler’s internal fins, reducing heat transfer efficiency. That means higher intake air temperatures and less power. It also coats the air filter, throttle body, and mass airflow sensor, which can cause drivability issues. A catch placed before the PCV line re-entry keeps the intercooler and intake tract clean.

Maintaining Proper Octane / Preventing Detonation

Oil vapors entering the combustion chamber have a lower octane rating than gasoline, which can promote knocking or pre-ignition, especially in high-compression or forced-induction engines. By removing those vapors before they reach the intake, a catch can helps maintain the effective octane of the air-fuel mixture, reducing knock events and potential engine damage.

Reducing Oil Consumption

While a catch can doesn’t fix mechanical oil burning (worn rings, valve guides), it does capture the oil that the PCV system would otherwise suck into the intake and burn. Many owners, like Lisa with her WRX, see a clear reduction in oil consumption after installation. This also means less frequent top-ups and less risk of low-oil-level damage.

Types of Catch Cans and What Works Best

Not all catch cans are created equal. The Nashville crowd has tested a variety of designs, and here’s what they’ve found.

TypeProsConsBest For
Baffled / Mesh DesignEfficient separation, durable, minimal maintenanceCan be bulky, slightly more expensiveStreet-driven daily drivers and track cars
Filtration ElementVery fine capture, compactFilter can clog, may restrict flowLow-boost, naturally aspirated engines
Dual Can / Dedicated PCV + Crankcase VentFull control, ideal for high-horsepower buildsComplex installation, more costTurbocharged and supercharged muscle cars
Vented (Atmospheric) CanAllows pressure equalization, simple installationMay release odor, not legal in all areasOff-road / track-only cars

For most daily-driven cars in Nashville, a sealed, baffled catch can designed for the specific engine platform is the best choice. Many local shops like Good Speed Performance offer custom installation and recommendations tuning for the region’s climate.

Installation Considerations for Nashville Drivers

Ease of Drain and Location

Engine bays in modern performance cars are tight. Choose a catch can that can be mounted securely—preferably somewhere with easy access to a drain valve. Some owners mount cans on the inner fender or near the strut tower. Keep it away from heat sources (exhaust manifolds) and moving parts.

Check Valves and Venting

Some catch cans include a built-in check valve or require one inline. This prevents the can from creating a vacuum leak or allowing backflow. For boosted engines, a check valve is often necessary to prevent boost from pressurizing the crankcase through the PCV hose. Always follow manufacturer instructions.

Local Emissions and Inspection Considerations

Tennessee does not have mandatory vehicle emissions testing in most counties, including Davidson County (Nashville). However, it’s still smart to keep the factory PCV system functional. A catch can is typically a “pass-through” device and does not eliminate emissions components. Some high-end cans are designed to be CARB-legal and maintain all OEM connections, which can be helpful if you move or sell the car.

Seasonal Maintenance

Nashville experiences humid summers and cold winters. In winter, moisture can condense more heavily in the catch can, potentially freezing in subzero conditions. Owners who drive in very cold temps should check and drain the can more frequently. Using a can with a larger volume helps prevent overflow.

Comparing Catch Cans to Other Oil Separation Solutions

Some aftermarket systems go beyond a simple catch can. Here’s how they stack up:

  • Air/Oil Separators (AOS): Often integrated into the PCV system and recirculate the captured oil back to the pan rather than storing it. This is cleaner (no draining) but can be more expensive and complex. For tracking, an AOS may be preferred. But many Nashville owners prefer catch cans because they can see and dispose of the nasty fluid.
  • PCV Delete / Crankcase Evacuation: This routes all gases to a vent or exhaust. It can increase power but may not be street-legal and often causes oil smells. Rarely used on daily drivers.
  • Oil Cap Breathers: These simply vent the crankcase to atmosphere via an oil cap. They do not separate oil and can cause a messy engine bay. Not recommended except for nostalgia builds.

The catch can remains the best balance of cost, effectiveness, and ease of use for the majority of Nashville’s performance car owners.

Expert Insights from Nashville Automotive Professionals

We spoke with several local mechanics and tuners who see catch cans daily. Their observations reinforce the community stories.

Marcus King, owner of King’s Autoworks (Madison, TN): “In the last three years, I’ve installed catch cans on at least fifty cars—everything from Mustangs to Miatas. Every single customer has noticed improvement in idle quality and fuel trims. For direct-injection engines, it’s almost mandatory. I tell people: ‘If you plan to keep your car for more than 60,000 miles, a catch can is cheaper than a valve cleaning.’”

Sarah Lang, engine builder at Performance Rebilt: “When we tear down an engine that used a catch can, the intake valves look much cleaner. It’s not a perfect cure—you still get some deposits—but we see a 60–70% reduction compared to cars without one. And the oil in the pan stays cleaner longer because less blow-by contamination is recirculated.”

Jake Turner, Dyno Operator at Nashville Speed Shop: “I’ve seen cars pick up 5–10 horsepower on the dyno after a catch can install. That’s because the engine isn’t fighting against a dirty intake system. It’s not a mod you do for peak power, but it helps the engine make that power consistently, pull after pull.”

Common Myths About Catch Can

Despite their popularity, some misconceptions persist.

  • Myth: Catch cans are only for race cars. Fact: Daily drivers, especially with GDI, benefit just as much. Oil vapor buildup happens every mile.
  • Myth: They void factory warranties. Fact: A properly installed catch can that does not alter emissions systems generally does not void a warranty, but check with your dealer. Most are transparent.
  • Myth: Catch cans require constant attention. Fact: Draining every oil change or every 3,000 miles is sufficient for most drivers. Some cans have a sight tube for easy checking.
  • Myth: They hurt performance on naturally aspirated cars. Fact: NA engines still have PCV systems that oil up intakes. The benefits are real, though less dramatic than on forced-induction engines.

Choosing the Right Catch Can for Your Nashville Car

With so many options, it helps to match the product to your driving style and engine type. Here’s a quick guide:

For Daily-Driven Muscle Cars (Mustang, Camaro, Challenger)

Look for a dual-valve catch can rated for high flow. Brands like Mishimoto and JLT Performance are popular among Mustang owners. For the Challenger, Billet Technology offers a direct-fit kit. Expect to pay $150–$300.

For Turbo Imports (Subaru, Mitsubishi, BMW, VW)

These engines often produce more blow-by. A baffled can with internal sump is ideal. Radium Engineering and Crawford Performance make excellent units for Subarus. For BMW S55/S58 engines, BMS has well-engineered kits.

For Lightly Modified Daily Drivers

Even a universal catch can from Edelbrock or Megan Racing can work with proper hoses. Install it and drain it when you change the oil.

Step-by-Step: How to Drain and Maintain Your Catch Can

  1. Check fluid level: Most catch cans have a clear or translucent reservoir. If you see a dark fluid line, it’s time to drain.
  2. Drain when engine is warm: Warm oil flows easier. Pop the hood and locate the drain valve or drain plug (usually at the bottom).
  3. Collect the fluid: Not all fluids are identical. You may see a mixture of oil, water, and black sludge. Dispose of it at a used oil recycling center.
  4. Inspect hoses and connections: Make sure no hoses are kinked or cracked. Replace if needed.
  5. Frequency: Every 2,000–5,000 miles depending on driving conditions. Track cars may need draining after each event.

Final Word: Why Nashville Owners Keep Coming Back to Catch Cans

The success stories from John, Lisa, Mike, and dozens of other Nashville performance car owners are backed by engineering and real-world experience. A catch can is a low-cost investment that pays for itself in reduced carbon cleaning, oil savings, and peace of mind.

Whether you’re building a weekend track monster or just want your daily driver to run cleanly for years, adding a catch can is one of the smartest moves you can make. And in a city where car culture runs deep, these small cans have proven to make a big difference. As Marcus King put it: “I’ve never had a customer come back and say they regretted installing one. Not once.”