Our Top Picks
- Best Road Performance: Stillen SMZ Performance Package. It provides a massive 65-horsepower increase over the stock model, turning a fast grand tourer into a legitimate supercar hunter of its era.
- Most Functional Aero: Stillen High-Profile Rear Wing. Unlike most aftermarket additions, this wing actually improves rearward visibility compared to the factory 300zx spoiler while adding necessary downforce.
- Key Collector Metric: Original Dealer-Sold SMZ Window Sticker. Finding an example with the original documentation is essential for verifying its status as one of the few factory-warrantied specials.
The Stillen 300ZX SMZ delivered 365 horsepower and 0.92g of lateral grip through a close-knit collaboration between Steve Millen and Nissan North America. Only 104 units were produced between 1995 and 1996, creating a rare, factory-warrantied performance icon that effectively bridged the gap between IMSA racing technology and 90s sports car street performance.
When the Nissan Z32 300ZX debuted, it was already a masterclass in engineering. It was a car that didn't just compete with its peers; it looked them in the eye and demanded they do better. However, even the best factory efforts leave something on the table for the true enthusiast. This is what I call the Improvement Paradox: how do you enhance a car as balanced as the Twin Turbo Z32 without ruining the very refinement that makes it great?
The answer came from Stillen. By blending race-ready performance with a level of fit and finish that satisfied Nissan's own strict warranty requirements, the stillen 300zx became more than just a modified car. It became a legacy. Behind the wheel, the difference is immediate. The car feels lighter on its feet, more eager to rotate, and possesses a mid-range punch that the factory car simply couldn't match.
The Legend of Steve Millen: From IMSA GTS to the SMZ
To understand why the stillen 300zx exists, you have to look at the trophy cabinet of Steve Millen. In the early 90s, Millen was dominating the IMSA GTS class in a wide-body 300ZX. He wasn't just a driver; he was an engineer at heart who understood the nuances of the Z32 chassis better than almost anyone outside of Japan.
The decision to build the SMZ was born from a desire to bring that IMSA GTS heritage to the showroom floor. Stillen didn't just bolt on parts in a backyard garage. They operated out of a sophisticated facility in Costa Mesa, California, where the engineering was done with a level of precision that caught the eye of Nissan North America. The result was a partnership that allowed these cars to be sold as a 300zx smz directly through select dealerships.
When you sit in the cockpit of an SMZ, you aren't just sitting in a tuned car; you are sitting in a piece of racing history. The stillen smz performance was tailored to be a driver’s car first and foremost. Every tweak to the suspension and every modification to the engine was tested on the same tracks where Millen earned his championships. This wasn't about making a loud car; it was about making a faster, more capable machine that felt like something the factory would have built if they didn't have to worry about mass-market compromises.
Power and Precision: The 365 HP Transformation
The heart of the transformation lies within the VG30DETT engine. In its factory form, the twin-turbo V6 was a marvel, but Stillen knew it had more to give. By integrating a new high-flow intake manifold and a refined stillen exhaust 300zx system, they allowed the engine to breathe with far less restriction.
The results were transformative. The modified 3.0-liter twin-turbo V6 engine produced 365 horsepower and up to 384 lb-ft of torque, which was a massive 65-horsepower jump over the standard factory package. This wasn't just achieved through bolt-ons; the SMZ utilized an additional 2 psi of boost, carefully managed to ensure long-term reliability.
Driving this car today, the first thing you notice is the torque curve. While the stock Z32 can feel a bit sleepy before the turbos fully spool, the SMZ has a significantly torquier midrange. This makes high-speed passing effortless. You don't always need to drop a gear; you just lean into the throttle and let the stillen smz performance take over. The 0-60 mph sprint is improved by roughly 0.3 seconds, but the real story is how the car pulls from 60 to 100 mph.
To manage this power, Stillen also included a 300zx stillen short shifter, which tightens up the throws and provides a tactile, mechanical click that the somewhat rubbery stock shifter lacks. It connects the driver to the machine in a way that encourages aggressive gear changes.
| Feature | Stock Z32 Twin Turbo | Stillen SMZ |
|---|---|---|
| Horsepower | 300 hp | 365 hp |
| Torque | 283 lb-ft | 384 lb-ft |
| 0-60 MPH | 5.6 seconds | 5.3 seconds |
| Skidpad Grip | 0.86 g | 0.92 g |
| Braking (60-0) | 195 feet | 187 feet |
Handling Dynamics: 0.92g and Beyond
Raw power is useless if you can't put it to the ground, and this is where the 300zx stillen suspension performance truly shines. The Z32 was always a heavy car, often criticized for its "GT" feel rather than being a pure "sports car." Stillen addressed this by installing higher-rate springs and significantly stiffer anti-roll bars.
On the skidpad, these changes raised the lateral grip to a impressive 0.92 g. But numbers only tell half the story. On a winding canyon road, the SMZ feels remarkably planted. The body roll that plagued the stock Z32 is almost entirely absent. Much of this poise comes from the specialized Yokohama AVS tires wrapped around custom 17-inch wheels. These tires were the gold standard of the 90s, offering a level of communication through the steering wheel that is rare in modern electric-rack cars.
Stopping power was also a priority. The nissan 300zx stillen brake upgrades included cross-drilled rotors and high-performance pads, which shortened the 60-0 mph stopping distance to 187 feet. In an era before massive multi-piston Brembos were standard on every performance car, this setup was world-class. The brake pedal feel is firm and inspires confidence, allowing you to trail-brake into corners with precision.
Functional Form: The Stillen 300ZX Aero Package
Visually, the SMZ is a statement. Stillen didn't go for the "fast and furious" look; they went for functional aggression. The front profile is dominated by a mockup-louvered nose panel and a specialized front spoiler designed to channel air more effectively to the intercoolers and brakes.
The most debated element of the build was often the 300zx spoiler. While most Z32 enthusiasts were used to the low-profile factory wing, Stillen opted for a tall, high-profile rear wing. To my surprise during testing, the 300zx stillen wing visibility is actually superior to the stock version. Because the wing sits higher, it clears the direct line of sight through the rearview mirror, effectively "framing" the traffic behind you rather than blocking it.
The interior didn't escape the Stillen touch either. Custom carbon fiber accents replace the somewhat dated-looking plastic trim of the mid-90s, and aluminum pedals provide a racing feel underfoot. It’s a cabin that feels purposeful, reminding you that this isn't just a standard Nissan.
Collector’s Outlook: Rarity and the Factory Warranty
One of the most remarkable things about the stillen 300zx was its relationship with the manufacturer. Typically, once you modify an engine to this degree, your warranty is gone. But because the SMZ was developed in cooperation with Nissan, it was sold new through United States Nissan dealerships and was covered by a full factory-backed powertrain warranty. This gave buyers the peace of mind to actually drive the car as it was intended.
However, rarity is the real driver of value today. While the initial goal was much higher, only 104 units of the Stillen SMZ were produced between 1995 and 1996. This makes it one of the rarest variants of the Z32 generation. For collectors, an SMZ represents the pinnacle of the 90s Japanese sports car boom, standing alongside cars like the NISMO 400R in terms of cultural significance, if not outright fame.
Logan’s Tip: VIN Verification If you are looking to purchase a stillen 300zx smz, always check for the Stillen-specific door jamb sticker and the numbered dash plaque. Because many owners bought the 300zx stillen body kit or stillen exhaust 300zx separately for their own builds, a true SMZ must have the documentation showing it was one of the original units sold through the dealer network.
As we look at the modern Nissan Z, it’s clear that the spirit of the SMZ lives on. But there is something visceral about the SMZ—the smell of the 90s leather, the mechanical hiss of the twin turbos, and the weighted feel of the steering—that modern cars can't replicate. It was a moment in time where a racing legend and a major manufacturer shook hands to create something perfectionists could finally call "finished."
FAQ
What performance parts does Stillen offer for the Nissan 300ZX?
Stillen offers a wide range of components including high-flow intake manifolds, stainless steel exhaust systems, upgraded intercoolers, and high-performance brake rotors. They also provide suspension components like stiffer anti-roll bars and adjustable strut tower braces designed specifically for the Z32 chassis.
Is Stillen still making body kits for the 300ZX?
While many of the original 1990s molds have been retired, Stillen periodically offers some body components like front lips and wings. However, many of the specific SMZ-only components like the mock-louvered nose panel have become rare items often sought after in the secondary market or through specialized Z-car retailers.
How does a Stillen intake improve 300ZX performance?
The Stillen intake improves performance by replacing the restrictive factory air box with a high-flow filter and a more direct plumbing route. This reduces the effort required for the twin turbos to pull in air, leading to faster spool times and improved throttle response, which is crucial for the heavy Z32.
Are Stillen exhaust systems worth it for a Nissan 300ZX?
A Stillen exhaust is widely considered one of the best upgrades for the Z32 because it provides a deep, throaty sound without the excessive "drone" found in cheaper aftermarket systems. It also improves horsepower by reducing backpressure, which is essential when increasing boost levels on the twin-turbo engine.
What is the difference between Stillen and OEM 300ZX parts?
The main difference is the performance ceiling. OEM parts are designed for longevity, quietness, and average driving conditions. Stillen parts are engineered for the enthusiast, using higher-grade materials and more aggressive tolerances to provide better grip, faster acceleration, and more tactile feedback while maintaining a factory-like fit.
