In short, Borla exhausts typically deliver modest horsepower increases, usually in the single-digit to low-double-digit range for many stock, naturally aspirated engines. Higher gains are possible when the exhaust is paired with headers, high-flow catalysts, and proper tuning. The exact number depends on the vehicle and setup.
The question is nuanced: Borla sells a family of exhaust systems—from cat-back to headers—that are designed to improve flow, sound, and weight. The horsepower payoff isn’t universal and can vary widely based on engine type, displacement, whether the engine is turbocharged, exhaust routing, and whether the engine is tuned to take advantage of the freer flow. Below is a guide to what you might expect on common setups.
Typical gains by configuration
This section breaks down the range of horsepower gains you might see with Borla exhaust configurations. Numbers are approximate and depend on the specific car and other modifications.
- Cat-back exhaust on a typical naturally aspirated engine: commonly around 5-12 HP on a dynamometer, with more noticeable mid-range torque improvements but modest peak gains.
- Cat-back exhaust on a modern performance engine with stock tuning: typically 5-15 HP; some vehicles may see higher gains after ECU reprogramming.
- High-flow headers with a cat-back (header-back) or complete system: frequently 15-30+ HP, particularly on engines that are throat-limited by the stock exhaust and when paired with tune or intake upgrades.
- Turbocharged or supercharged engines: gains from exhaust alone are often smaller; roughly 5-15 HP is a common ballpark, with larger increases contingent on tuning and overall airflow improvements.
Conclusion: The horsepower impact of a Borla exhaust varies by model and other modifications. Cat-back systems yield modest gains, while pairing with headers and tuning can produce more substantial increases.
Reality check
Marketing numbers reflect ideal testing conditions and specific vehicle configurations. Real-world dyno results depend on engine design, existing exhaust restrictions, altitude, weather, and whether the ECU is tuned to the new flow characteristics.
What factors influence the measured gain?
Several variables drive the actual horsepower you’ll see:
- Engine type and displacement
- Forced induction (turbo/supercharged) vs. naturally aspirated
- Exhaust configuration (cat-back vs. headers) and catalyst quality
- ECU tuning and intake system compatibility
- Overall vehicle setup and testing conditions
These factors explain why two identical Borla kits on different cars can yield different horsepower figures, and why installation quality matters as well as dyno calibration.
Summary
Borla exhausts can provide horsepower gains, but the amounts are not universal. Cat-back systems typically deliver modest gains on naturally aspirated engines, often in the 5-12 HP range, with larger gains possible when combined with headers and proper tuning. On turbocharged or supercharged engines, the exhaust-alone gains tend to be smaller and highly dependent on the rest of the intake-tuning package. Always check the manufacturer’s specifications for your exact model, and consider dyno testing to confirm the actual figure for your vehicle. Beyond horsepower, many buyers value the improved flow, weight savings, and distinctive exhaust note, while also considering warranty and emissions compliance.
Which is louder, Borla or Flowmaster?
Sound is one of the biggest factors when choosing an exhaust system.
- Borla exhausts produce a clean, aggressive tone with minimal drone, thanks to the straight-through design and Polyphonic Harmonizer technology.
- Flowmaster exhausts have a louder, deeper growl with a more traditional muscle car tone.
What size exhaust for 700 hp?
Horsepower-Based Exhaust Sizing Chart
| Power (hp) | Single Exhaust Outer Diameter (in) | True Dual Exhaust Tubing Outer Diameter (in) |
|---|---|---|
| Up to 500 hp | — | 3″ |
| Up to 700 hp | — | 3.5″ |
| Up to 850 hp | — | 4″ |
| Up to 1,000 hp | — | 4.5″ |
How can I add 200 hp to my car?
How to Have More Horsepower
- Turbochargers & Superchargers. Perhaps the most popular and well-known way to add horsepower to your vehicle is to install a turbocharger or supercharger.
- Cold Air Intake.
- High-Performance Exhaust.
- Aftermarket Headers.
- ECU Tuning.
Do Borla exhausts add horsepower?
Borla exhaust systems are designed to have the optimal diameters and low restriction flow that promote scavenging. The Borla R&D team performs dynamometer testing on new parts to ensure power gains. We frequently see gains in the 8 to 12 horsepower range, sometimes much higher.