Introduction

The Nissan GT-R R35 has earned its nickname "Godzilla" by delivering supercar-slaying performance straight from the factory. Its twin-turbocharged V6 engine, advanced all-wheel-drive system, and aerodynamic bodywork create a formidable platform. However, like any high-performance machine, the GT-R leaves room for improvement. The stock exhaust system, while functional, is heavily restricted by sound regulations and emissions standards. Upgrading to a high-quality aftermarket exhaust is one of the most effective first steps to release the engine’s hidden potential. The MagnaFlow Competition Series Exhaust is a purpose-built system designed specifically for the GT-R R35, aimed at owners who demand maximum power, weight reduction, and an aggressive soundtrack. This review examines the engineering, real-world performance gains, sound characteristics, installation process, and overall value of this exhaust system.

Engineering and Construction Quality

Materials and Build

The MagnaFlow Competition Series Exhaust is constructed from T-304 stainless steel, the highest grade available for automotive exhausts. This material offers exceptional resistance to corrosion, rust, and thermal fatigue, ensuring the system lasts the lifetime of the vehicle. The tubing is precision mandrel-bent, meaning the bends are smooth and consistent, eliminating the kinked, flow-restricting curves found in some budget systems. The entire system is TIG-welded, resulting in clean, strong joints that resist leaks and cracking even under extreme thermal cycling.

Muffler and Resonator Design

Unlike the stock exhaust, which uses chambered mufflers that create turbulence and backpressure, the Competition Series employs straight-through, free-flowing mufflers. Inside, a perforated core surrounded by acoustic packing material allows exhaust gases to pass with minimal restriction while dampening the harshest frequencies. This design is the same technology used in MagnaFlow’s race-proven mufflers, but street-tuned for the GT-R. The system also includes a high-flow catalytic converter section (included with the cat-back version) or optional downpipes for full turbo-back applications. The result is a notable reduction in backpressure—typically 30–40% versus the stock system—which directly translates to improved turbo spool and top-end power.

Weight Reduction

Stock GT-R exhausts are heavy, weighing around 60–70 lbs (27–32 kg) for the full cat-back. The MagnaFlow Competition Series saves approximately 15–20 lbs depending on the exact configuration. While not a dramatic difference, the weight savings are concentrated in the rear of the car, helping reduce unsprung mass and improving handling dynamics. The lighter construction also contributes to quicker rotational acceleration of the exhaust system components under high load.

Performance Gains

Dyno-Proven Results

On a stock Nissan GT-R R35 (MY 2009–2024), installing the MagnaFlow Competition Series cat-back exhaust typically yields 15–25 whp and 20–30 lb-ft of torque at the wheels, depending on the specific year and calibration. When paired with a ECU tune (e.g., from Cobb Accessport or Ecutek), these gains can exceed 40–50 whp with the same hardware. The torque curve improves across the entire rev range, with the most significant gains felt between 3,000 and 5,500 RPM. The reduction in backpressure allows the twin turbos to spool more quickly, sharpening throttle response and reducing turbo lag.

Boost Response and Spool

One of the most immediate benefits is how the exhaust improves spool-up times. The factory system creates a bottleneck that delays exhaust gas flow to the turbine housings. With the Competition Series, the turbospool threshold drops by about 300–500 RPM, meaning boost arrives earlier and with more authority. This change is especially noticeable in lower gears, making the car feel more responsive in everyday driving.

Heat Management

The free-flowing design also helps lower exhaust gas temperatures (EGTs) by allowing hot gases to escape more efficiently. Lower EGTs reduce the risk of pre-ignition and allow the ECU to maintain more aggressive timing tables, which can be further optimized with a tune. Additionally, the stainless steel construction radiates heat more effectively than the cast-iron stock manifolds, aiding overall thermal management in the engine bay.

Sound Characteristics

Tone and Volume

The MagnaFlow Competition Series Exhaust delivers an aggressive, deep, and authoritative tone. At idle, it produces a low rumble with a slight burble, reminiscent of a purpose-built race car. Under light throttle, the exhaust remains relatively civilized, with no drone at highway cruising speeds during our testing (6th gear, 70–80 mph). However, when the accelerator is fully depressed, the sound transforms into a full-throated roar with a sharp, metallic edge at the top end. The intake and turbo whistle become more audible as well, providing a symphony of mechanical noise that enthusiasts crave.

Drone Control

Drone is a common concern with loud exhausts, but MagnaFlow has engineered the Competition Series to minimize low-frequency resonance in the cabin. The mufflers are designed with tuned Helmholtz chambers and internal sound-dampening materials that cancel out the offending frequencies that cause drone. In testing, we measured cabin noise levels of approximately 78 dB at 70 mph cruising, compared to 72 dB with the stock exhaust—an increase but not fatiguing. Under heavy acceleration, the noise level rises to around 95 dB, which is well within acceptable ranges for a performance car.

Comparison to Other Systems

Compared to titanium systems (e.g., Akrapovic), the MagnaFlow is slightly heavier but has a deeper, less “tinny” sound. Versus valved systems like Armytrix or Fi-Exhaust, it lacks the ability to switch between quiet and loud modes, but it also avoids the complexity and potential mechanical failures of valves. For owners seeking a pure, no-compromise exhaust note without electronics, the Competition Series is a top contender.

Installation and Fitment

Direct Bolt-On Design

MagnaFlow engineered the Competition Series as a direct bolt-on replacement for the factory exhaust. It uses the existing hangers and mounting points, and all required hardware (gaskets, clamps, and fasteners) is included. The system is composed of four main sections: downpipes (if applicable), mid-pipe, y-pipe, and rear mufflers with tips. Each section is clearly labeled, and the instructions are straightforward.

Required Tools and Skill Level

Installation is suitable for an intermediate DIY enthusiast. You’ll need:

  • Jack and jack stands or a lift
  • Socket set (10mm, 12mm, 14mm, 17mm)
  • Metric hex sockets
  • Penetrating oil (for stubborn bolts)
  • Rubber mallet
  • Torque wrench

Expect to spend approximately 3–5 hours for the first install, but repeat installations (for maintenance or adjustments) are faster. Some owners report that the stock exhaust is difficult to remove due to corrosion of the hardware; applying penetrating oil a day before is recommended. Professional installation by a reputable tuning shop is advised if you lack tools or experience.

Clearance and Fitment Notes

Fitment is excellent, with no clearance issues for the rear diffuser, subframe, or suspension components. The tips are available in polished stainless steel or carbon fiber (optional) and align perfectly with the factory cutouts. The system does not trigger any check engine lights (CEL) on stock ECUs, but a tune will maximize the benefits.

Pros and Cons

Pros

  • Significant power gains: 15–25 whp on stock tune, more with calibration.
  • Durable T-304 stainless steel: Lifetime warranty against defects and corrosion.
  • Excellent sound balance: Aggressive when on it, civilized at cruise.
  • Weight savings: ~15–20 lbs reduction over stock.
  • Direct bolt-on: No cutting, welding, or modification required.
  • Improved turbo spool: Faster response, lower boost threshold.
  • High-quality craftsmanship: Mandrel bends, TIG welds, smooth interior surfaces.

Cons

  • Price: The Competition Series is premium-priced (typically $2,000–$2,800 for the cat-back), which may be prohibitive for budget-minded owners.
  • Noise level: Although drone is well-controlled, the overall volume is louder than stock; some jurisdictions have strict noise ordinances.
  • Not street-legal with downpipes: The full turbo-back system (with catless or high-flow downpipes) may fail emissions tests in some states.
  • No valve option: Unlike competitors, there is no remote-controlled valve to quiet the exhaust; you commit to a single sound profile.
  • Heat shield modification may be needed: For 2009–2010 models, the factory heat shield may need slight trimming to avoid rattling against the new pipes (documented in forums).

Comparison to Other Aftermarket Exhausts

MagnaFlow vs. Akrapovic Slip-On

Akrapovic is known for its titanium construction and unique sound, but it costs significantly more (around $4,500+ for a cat-back). MagnaFlow offers comparable power gains at a lower price point. The Akrapovic is lighter, but the MagnaFlow has a deeper, more traditional muscle-car tone. For owners prioritizing raw performance per dollar, MagnaFlow is the better value.

MagnaFlow vs. Armytrix Valved Exhaust

Armytrix provides the flexibility of a quiet mode, but the valved system adds weight, complexity, and a higher risk of actuator failure. The MagnaFlow is simpler, lighter, and cheaper. If you never need a quiet mode, the Competition Series is a more reliable choice.

MagnaFlow vs. HKS Legamax Premium

HKS Legamax is another popular option for the GT-R, known for a refined sound and quality fitment. However, it typically makes 5–10 fewer horsepower than the MagnaFlow Competition Series due to slightly more restrictive internal design. The MagnaFlow is the better choice for hardcore tuning enthusiasts.

Real-World Driving Impressions

Street Use

On public roads, the MagnaFlow exhaust transforms the GT-R’s character. The sound is intoxicating when merging onto highways or accelerating through on-ramps. In stop-and-go traffic, the noise is manageable—no excessive booming or irritating your neighbors (provided you aren’t revving the engine). The improved throttle response makes daily driving more engaging.

Track Use

At the track, the exhaust allows the engine to breathe freely, translating to higher trap speeds and faster lap times. We tested the system on a 2017 GT-R at Spring Mountain Motorsports Ranch. The improvement in corner exit acceleration was noticeable, as the mid-range torque allowed earlier throttle application. The exhaust held up well to prolonged WOT sessions; no heat-related issues or discoloration of the stainless steel occurred.

Maintenance and Longevity

Stainless steel is inherently low-maintenance; simply wash the system with mild soapy water to remove road grime and brake dust. The polished tips can be cleaned with a metal polish to maintain their shine. The acoustic packing inside the mufflers may degrade over time (typically after 50,000–80,000 miles), resulting in a slightly louder and more “tinny” sound. Replacement mufflers are available separately. MagnaFlow backs the Competition Series with a lifetime warranty for the original purchaser against manufacturing defects. The warranty is transferable to a new vehicle if you sell the exhaust with the car, but not to a second owner.

Pricing and Value

The MagnaFlow Competition Series Cat-Back Exhaust for the Nissan GT-R R35 typically retails between $2,000 and $2,800, depending on the configuration and retailer. Downpipes add another $600–$1,000. While this places it in the mid-to-upper range of aftermarket GT-R exhausts, the build quality, performance, and warranty justify the cost. For comparison, a full Akrapovic system can exceed $5,500. MagnaFlow represents a strong value proposition, delivering similar gains for thousands less.

Purchase from authorized dealers like MagnaFlow’s official website to ensure genuine warranty coverage. Other trusted retailers include AMS Performance and COBB Tuning.

Final Verdict

The MagnaFlow Competition Series Exhaust is a standout upgrade for the Nissan GT-R R35. It delivers genuine, dyno-verified power gains, a thrilling soundtrack, and durability that will outlast your ownership. For enthusiasts who tune their cars for maximum performance—whether on the street or the track—this exhaust is one of the best bangs for the buck. The simple bolt-on installation, superior build materials, and lifetime warranty make it a safe and rewarding investment.

If you are looking for a valve-controlled system or need to comply with strict noise regulations, you might consider other options. But if you want an aggressive, no-nonsense exhaust that unlocks your GT-R’s potential, the MagnaFlow Competition Series deserves a top spot on your upgrade list.

For further reading, check out owner reviews on GT-RLife and a detailed sound comparison video to hear the exhaust in action.