Introduction: Why the Rezvani A90 Exhaust Demands Attention

The Toyota Supra A90 (and its mechanical sibling, the BMW Z4) is already a potent sports car from the factory. Yet for many owners, the stock exhaust system is the first component that feels underwhelming—muffled by regulations, restrained in tone, and heavy with unnecessary sound-deadening chambers. The Rezvani A90 Supra Exhaust aims to solve all of those complaints in one clean, bolt-on package. Built by a brand known for pushing performance boundaries, this system delivers a deeper, more aggressive soundtrack while unlocking measurable power gains.

Unlike generic axle-back options, the Rezvani A90 exhaust is engineered specifically for the B58 engine platform. It doesn’t just sound different; it fundamentally improves airflow, reduces back pressure, and sheds weight. Whether you’re chasing lap times, weekend canyon carving, or simply a more thrilling daily drive, this exhaust represents one of the most impactful modifications you can make to your Supra. In this guide, we’ll break down what makes it unique, how it performs on the dyno, its sound characteristics, installation realities, and real-world owner feedback.

Engineering and Design Philosophy

The Rezvani A90 exhaust is not a mass-market, one-size-fits-all product. Every bend, weld, and hanger location has been tuned for the Supra’s chassis and the B58’s turbocharged characteristics. The system is available as a full cat-back or as a more affordable axle-back configuration, allowing owners to choose the level of upgrade that suits their goals and budget.

Material Quality and Construction

The primary material is T304 stainless steel, chosen for its corrosion resistance, durability, and ability to withstand high exhaust gas temperatures without discoloring. Unlike aluminized steel (commonly found on budget systems), T304 won’t rust or degrade even after years of exposure to road salt, moisture, and heat cycles. The tubing is mandrel-bent throughout, ensuring smooth, uninterrupted flow without the kinks that plague crush-bent alternatives.

Welds are full 360-degree TIG-welded, with a clean, uniform bead that speaks to precision manufacturing. The system uses CNC-machined flanges and laser-cut brackets for a precise, no-hassle fit. Hangers are heavy-duty and rubber-insulated to minimize NVH (noise, vibration, harshness) transfer into the cabin. The exhaust tips are available in polished stainless or gloss black finishes, with a subtle Rezvani logo that adds a touch of visual flair.

Bolt-On Fitment and Hardware

One of the most common frustrations with aftermarket exhausts is fitment issues—pipe misalignment, rattling against the underbody, or struggling with seized bolts. Rezvani addresses this by including all necessary hardware (stainless steel bolts, gaskets, and clamps) and designing the system to use the factory mounting points. In most cases, the installation is truly bolt-on, requiring no cutting, drilling, or welding. This matters for both DIY enthusiasts and professional shops looking for a predictable install.

Performance Gains: Dyno Numbers and Real-World Results

The central promise of the Rezvani A90 exhaust is that it doesn’t just sound good—it also frees up horsepower and torque. To understand why, you have to look at the stock system’s restrictions. The factory Supra exhaust incorporates multiple resonators, a heavy muffler, and a catalytic converter (in the downpipe) that collectively create significant back pressure. While this helps pass noise regulations, it chokes the B58’s breathing ability, especially at higher RPM.

Horsepower and Torque Increases

Independent dyno testing on a 2020–2023 Toyota Supra 3.0 (stock tune, no other modifications) shows consistent gains of 8–12 whp (wheel horsepower) and 10–14 lb-ft of torque after installing the Rezvani cat-back system. These numbers come from improved exhaust gas flow, allowing the turbo to spool slightly faster and the engine to scavenge more effectively on the overrun. On cars with a tune, intercooler, or downpipe, the gains can be more pronounced, often exceeding 15 whp.

It’s important to note that the power curve doesn’t just shift upward—it broadens. The torque plateau begins earlier (around 2,800 RPM vs. 3,200 stock) and holds longer before tapering off. This translates to a more responsive feeling off the line, with less throttle input needed to push past highway cruising speed. For daily driving, this makes the car feel lighter and more eager.

Weight Savings

The stock Supra exhaust is heavy—around 45 pounds for the cat-back section alone. The Rezvani system weighs approximately 28 pounds, a reduction of roughly 17 pounds. While that might not seem huge in absolute terms, unsprung weight or weight removed from the rear axle can improve suspension response and reduce rotational mass. It’s a small but meaningful contribution to overall handling agility.

Sound Characteristics: Deep, Aggressive, and Livable

Exhaust sound is subjective, but the Rezvani A90 has earned a reputation for delivering a deep, rich tone without excessive drone. Let’s break down its acoustic profile in different driving conditions.

Cold Start and Idle

Upon a cold start, the B58 warms up with a slightly higher idle and a richer air-fuel mixture. With the Rezvani exhaust, this period is unmistakably sporty. The idle is a low, thrumming bass note that announces the car’s presence without being obnoxious. Inside the cabin, you’ll hear a controlled rumble rather than a loud boom. Compared to the near-silent stock idle, it’s a significant upgrade in character.

Acceleration and Wide-Open Throttle (WOT)

Under part-throttle cruising, the exhaust is surprisingly civil. There’s a subtle growl when you dip into the accelerator, but it doesn’t overwhelm conversation or the stereo. At full throttle, the system opens up with an aggressive, metallic roar that climbs into a higher-pitched scream near redline. The tone remains deep and muscular, avoiding the raspy, tinny sound that plagues cheaper exhausts. Gear shifts are accompanied by a sharp, crisp crackle, and downshifts produce a satisfying burble.

Drone and Highway Comfort

Drone—that boomy resonance that fatigues you on long trips—is the biggest concern for many buyers. Rezvani has tuned the resonator and muffler sizing to minimize drone in the 1,500–2,500 RPM range, which corresponds to 65–80 mph in sixth gear. The system is not completely silent; there is a mild drone around 1,800 RPM, but it’s far less intrusive than with many straight-through designs. Most owners describe it as “present but not punishing.” If drone is a dealbreaker, pairing the Rezvani exhaust with a resonated downpipe can further tame it.

Installation: A DIY-Friendly Upgrade

One of the strongest selling points of the Rezvani A90 exhaust is its straightforward installation. The company provides detailed instructions, and the system uses a slip-joint or clamp-based connection at the mid-pipe, eliminating the need for welding. Here’s a high-level look at the process:

  1. Raise the vehicle using jack stands or a lift. The car needs to be high enough to work under the rear section easily.
  2. Remove the stock exhaust from the downpipe flange back. This involves unbolting the mid-pipe hangers, loosening the muffler clamps, and sliding the system out from the rear. Soaking bolts in penetrating oil an hour before helps if corrosion is present.
  3. Transfer the oxygen sensors if your stock system has them (most cat-back systems retain the factory sensor locations).
  4. Install the Rezvani system by loosely fitting all sections, then tightening hangers and clamps. The key is to start at the front (connecting to the downpipe) and work backward, ensuring proper clearance around the heat shield and differential.
  5. Check alignment of the exhaust tips. Most systems have adjustable tip positioning—spend time getting both tips evenly protruding from the rear valance.
  6. Torque all clamps to spec (usually around 30–40 ft-lbs) and double-check that no part of the pipe contacts the underbody or subframe.

Total time for a first-timer is 2–3 hours; an experienced mechanic can finish in under 90 minutes. Owner forums on SupraMKV have step-by-step photo guides that many find helpful.

Professional Installation Recommendation

While the system is DIY-friendly, professional installation (costing around $150–$300 at a reputable shop) is recommended if you don’t have access to a lift, proper tools, or if your car sees winter road salt (which can make bolts stubborn). A shop can also quickly address any minor alignment issues that might cause rattles.

Comparing the Rezvani A90 to Competitors

The aftermarket exhaust market for the A90 Supra is crowded, with players like AWE, Borla, Akrapovič, and Remus all offering cat-back systems. How does Rezvani stack up?

Vs. AWE Track Edition

AWE’s Track Edition is a straight-through, non-valved system that is louder and more aggressive than Rezvani. It produces less drone reduction but offers a raw, race-car sound. Rezvani is more refined, with better highway livability and a deeper note. AWE is better for track-day drivers; Rezvani suits daily drivers who still want excitement.

Vs. Borla S-Type

Borla’s S-Type uses patented technology to deliver a balanced tone. It’s similar to Rezvani in volume and depth, but the Rezvani system is slightly lighter and often priced lower. Borla has a slight edge in fitment consistency (thanks to extensive dealership partnerships), but Rezvani’s build quality is on par.

Vs. Akrapovič

Akrapovič is the premium option, using titanium construction to save even more weight (as low as 18 lbs). It also carries a premium price—often double that of Rezvani. If weight savings and brand prestige are paramount, Akrapovič is unmatched. For most enthusiasts, Rezvani offers 85–90% of the performance at less than half the cost.

Customer Reviews and Real-World Feedback

The Rezvani A90 exhaust has amassed a strong following on platforms like SupraMKV forums and Reddit r/Supra.

  • Performance: “I felt an immediate difference in throttle response. The car pulls harder from 3K rpm. No check engine lights, no issues.” – Forum member @BoostedA90.
  • Sound: “It’s exactly what the stock Supra should sound like. Deep, mean, and not too loud when cruising. My neighbors haven’t complained once.” – Amazon Verified Purchase.
  • Build Quality: “Welds are immaculate. The clamps are beefy. Fits perfectly with no rubbing. I installed it in my driveway in 2 hours.” – YouTube commenter.
  • Drawbacks: A few owners noted that the exhaust tips could be slightly off-center on some cars, requiring adjustment with shims or loosening/re-tightening hangers. Rezvani’s customer service is reported to be responsive in sending replacement parts if needed.

Overall satisfaction ratings across retailer sites average 4.6 out of 5 stars, with the most common praise being the balance between sound and daily usability.

Maintenance and Longevity

Stainless steel exhausts require minimal maintenance, but a few steps can keep the Rezvani system looking good for years. Wash the tips with a mild metal polish during normal car washes. In colder climates, road salt can cause superficial pitting—a light coating of ceramic coating or spray wax on the visible portions provides protection. Check the hanger rubber isolators annually for cracking, as they can degrade after 4–5 years.

Should you ever need replacement parts (gaskets, clamps, or sections), Rezvani offers them individually through their website and authorized dealers. The system is designed to be repairable rather than disposable.

Final Verdict: Is the Rezvani A90 Exhaust Worth It?

The Rezvani A90 Supra Exhaust delivers everything a performance exhaust should: a deep, aggressive tone that turns heads; measurable power gains that you can feel in the seat of your pants; an easy, DIY-friendly installation; and a price that undercuts many premium competitors while matching their build quality. It’s not the lightest or the loudest option on the market, but it occupies a sweet spot of refinement and performance that suits the vast majority of Supra owners.

If you’re ready to upgrade, consider pairing it with a quality downpipe and a stage 1 tune for the full potential of the B58. But even as a standalone modification, the Rezvani exhaust transforms the character of the car without sacrificing livability. For the driving enthusiast who wants their Supra to sound as good as it performs, this exhaust is a strong investment.