The Pinnacle of
Forced InductionHas Arrived!
The Hlava STM delivers small-turbo response and big-turbo power. No wastegates. No electronics. One manifold, two turbos, zero compromise.
Every external connection and mounting point identified.
Turbocharging has always been a trade-off.
You pick your compromise. Fast spool or real top-end. Simple or powerful. The STM stops making you choose.
The old math // pick one
- Small turbos spool fast, then run out of breath up top.
- Big turbos make power, but you wait through the lag.
- Wastegates are the Exhaust Gas Control Method, so mounting, sizing and tuning are all critical.
- Electronic turbos add cost, wiring, and failure points.
The STM way // keep both
- Routes exhaust intelligently between two turbo sizes.
- Keeps the energy a wastegate would throw away.
- Runs fully mechanical, no wastegates required*See How It Works, simplified tuning.
- Kills the lag and keeps the power. Both. At once.
One manifold. Two turbos. A handoff you can feel.
Small turbo spools first
At low load, exhaust feeds the small primary turbo for near-instant boost, then flows through a 3-inch bridgepipe to prime the big one.
Smart valves route the flow
As pressure and volume climb, self-regulating bypass valves open incrementally, sending excess exhaust to the secondary turbo.
Big turbo takes over
At full flow the valves move clear of the gas path. The large turbo delivers its designed power while the small one stays primed for when shifting gears and decreased load conditions.
Boost at 50% throttle. Low RPM. Low speed. Real dyno pulls.
Snapshot: a Gen II 2860 (.86 A/R) paired with a G35-1050 (1.21 A/R). The transition from primary to secondary lands smooth, not stepped.
Figures reflect the dyno snapshot published on hlavastm.com for the specific turbo pairing above. Your numbers depend on your build, your turbos, and your fuel. Boost targets can be modeled with Garrett's turbo MAP method before you buy.
Three gas laws, working the exhaust for you.
The STM manages the pressure, temperature, volume, and velocity of exhaust gas so energy reaches the turbine instead of bleeding off. The valves self-regulate on those same variables.
Pressure & volume
As exhaust volume changes through the manifold's flow paths, pressure responds in step. The STM uses that relationship to keep gas moving toward the turbine.
Temperature & volume
Hot exhaust expands. The STM's geometry gives that expansion a forward path so the energy shows up as flow, not backpressure.
Pressure & temperature
Rising exhaust temperature raises pressure. Reading that pressure is how the bypass valves know when to open and hand off to the big turbo.
Built for the build.
Enthusiasts
Quicker spool, boost at part-throttle, and a build that turns heads. More fun every time you touch the pedal.
Shops & Tuners
A new revenue line with install guides, tech support, and real customer demand for proven sequential turbocharging.
OEM & Industry
Lower emissions, better economy, lighter and simpler than a supercharger. It fits any internal combustion engine built for forced induction.
Since 2013, one engineer chasing a better way to boost.
Andrew Hlava started this in 2013. The result is the patented Hlava STM, protected by two U.S. patents you can read yourself.
See it run before launch day. And an opportunity to receive preferred pre-purchase pricing.
Ride shotgun on a real street cruise and feel what zero-lag boost does at part throttle. Spots are limited per cruise date.
- Product release updates
- Dyno and daily-driving data before it's published
- Exclusive ride-along video links
- Early access to the membership program with pre-launch pricing