Table of Contents
Understanding Your Borla Exhaust System
Borla exhaust systems are engineered from premium T-304 stainless steel, a material chosen for its superior corrosion resistance and ability to withstand extreme temperatures. This alloy, combined with Borla's patented straight-through muffler design, delivers a distinctive sound and measurable horsepower gains. To keep your system performing like new, it helps to know the key components and how they work together:
- Exhaust pipes: Mandrel-bent to preserve internal diameter and flow, typically 2.5 to 3 inches on performance systems.
- Mufflers: Borla uses either their ProXS or Atak line, each with a specific tone profile, but all rely on a stainless-steel inner core and packed insulation.
- Exhaust tips: Often feature a double-wall construction to prevent blueing and are available in polished or carbon-fiber finishes.
- Hangers and clamps: Heavy-duty rubber isolators and stainless-steel band clamps absorb vibration and secure the system without leaks.
Knowing these parts helps you spot wear early and ensure proper fitment. Regular attention to each one extends the life of the entire assembly.
Regular Inspections: A Proactive Approach
Inspecting your Borla exhaust every 10,000 miles or at each oil change catches small problems before they become expensive repairs. Use a warm (but not hot) system after a short drive to check for the following:
- Check for rust or corrosion: Even with T-304 stainless, surface pitting can occur in salt-belt climates. Look for reddish-brown spots on the weld areas or near the muffler body.
- Examine hangers and clamps: Rubber hangers can dry out and crack, causing the exhaust to sag. Tighten any loose band clamps, as vibration loosens them over time.
- Listen for unusual noises: A hiss or ticking at idle often points to a small exhaust leak at a flange or slip joint. A rattle might indicate a broken internal baffle or a tip contacting the bumper.
- Inspect the tips: Discoloration—especially deep blue or purple—indicates running too lean or a timing issue. Heavy soot suggests a rich condition that may require tuning.
Document your findings in a simple log. This record becomes valuable when discussing warranty claims or ordering replacement parts.
Cleaning and Polishing Your Borla System
A clean exhaust not only looks good but also prevents buildup of road grime that can trap moisture. Follow this safe cleaning procedure:
- Allow the system to cool completely. Hot metal can react with cleaners and create streaks.
- Spray a mild automotive soap mixed with water onto the tips and visible pipes. Avoid degreasers with harsh acids.
- Scrub with a non-abrasive sponge or microfiber mitt. For stubborn baked-on brake dust, use a dedicated stainless-steel polish such as Blue Magic or Mothers Mag & Aluminum Polish.
- Rinse thoroughly with distilled water to avoid mineral spots, then dry with a clean soft towel.
- For the underside of the muffler, a gentle rinse with a garden hose is sufficient—avoid high-pressure spray that could force water into the packed insulation.
Never use steel wool, scouring pads, or oven cleaner. These will scratch the brushed finish and damage the metal's protective oxide layer. If your system develops a haze of light oxidation, a quick pass with a metal polish once per season restores the luster.
Addressing Common Issues
Even a well-maintained Borla system can develop minor problems. Here’s how to handle the most frequent complaints:
Leaking Joints
Slip joints and band clamps are designed to seal as the system heats and expands. A cold leak on startup often disappears once the metal warms. If you still hear a leak after five minutes of driving, check the clamp alignment. Loosen the clamp, reposition the pipe so the overlap is even, then retighten to the manufacturer's torque spec (typically 35–45 lb-ft). If the gasket between two flanges is compromised, replace it with a high-temperature exhaust gasket.
Excessive Noise or Drone
A sudden increase in loudness may indicate a broken internal baffle in the muffler. Tap the muffler body with a rubber mallet while the engine is off—if you hear debris rattling inside, the core has separated. Borla mufflers are welded, not packed, so a baffle failure means replacement under warranty. For drone at specific RPMs, consider adding a Helmholtz resonator or a small muffler insert designed for Borla's 4-inch round bodies.
Rust and Corrosion
T-304 is highly resistant, but it can still show surface rust if exposed to chloride from road salt or coastal air. Light rust can be removed with a non-woven abrasive pad and stainless-steel cleaner. For deeper pitting, use a rust converter specifically labeled for stainless, then apply a ceramic coating to protect the affected area. Aftermarket ceramic coatings from brands like Jet-Hot are a permanent solution for high-exposure components.
Hanger Wear
Rubber hangers flatten over time, allowing the system to shift and contact the chassis. Replace them with heavy-duty polyurethane units from a company like Energy Suspension. These last much longer and reduce vibration transfer into the cabin.
Longevity Tips: Extending the Life of Your System
Beyond routine inspections and cleaning, your driving habits and environment play a big role in how long a Borla exhaust lasts.
- Warm up the system properly: Avoid revving a cold engine. Let the exhaust warm gradually so thermal expansion is uniform. Rapid temperature changes stress the welds and can cause cracking.
- Minimize short trips: Frequent cold starts without reaching full operating temperature allow moisture to accumulate inside the muffler, accelerating oxidation. If you drive mostly short distances, take the car on a 20-minute highway cruise once a week to dry out the system.
- Avoid deep water and road salt: While Borla's stainless steel is resistant, submerging the muffler in water can force moisture into the packing around the core. In winter, wash the underside of the vehicle monthly to remove salt residue.
- Check hanger alignment after any repair: If you replace a hanger or clamp, verify that the entire system hangs parallel to the chassis. A misaligned system creates binding that leads to premature rubber fatigue and metal fatigue at the hanger tabs.
Professional Maintenance vs. DIY
Many Borla owners enjoy doing their own maintenance, but certain tasks are better left to professionals:
| Task | DIY Suitable | Best Left to Pro |
|---|---|---|
| Visual inspection | Yes | |
| Cleaning tips and pipes | Yes | |
| Retightening clamps | Yes | |
| Replacing rubber hangers | Yes | |
| Gasket replacement | Yes (if welding needed) | |
| Muffler core failure | Yes (warranty replacement via dealer) | |
| Ceramic coating application | Yes |
If your system is still under Borla's 1,000,000-mile warranty, any modification or attempted repair could void coverage. Always contact Borla's customer service or an authorized dealer before performing repairs that involve welding or cutting. For professional assistance, look for shops listed on Borla's dealer locator.
Conclusion
A Borla exhaust system is an investment in your vehicle's sound, performance, and curb appeal. With proper care—regular inspections, mindful cleaning, and prompt attention to small issues—the system will deliver rewarding performance for hundreds of thousands of miles. Whether you maintain it yourself or rely on a qualified shop, staying proactive ensures your Borla continues to provide the aggressive tone and horsepower gains you paid for. For additional tips on general exhaust care, refer to this guide from Car and Driver or the official Borla care and maintenance page.