Plug-in ECU tuner for cars and trucks

Monte adjusts the calibration inside the ranges the factory ECU already allows and leaves every factory safeguard and knock-protection strategy active. There is no ECU flash — nothing is rewritten, and every OBD monitor stays complete. Independent bench testing at SEMA Garage found no fault codes and no disabled systems. Like any tune, it adds load in Performance modes — use them as intended.

No. Most “performance chips” sold online are cheap impulse buys that promise outrageous power gains — inside is usually a resistor or an LED, and they don’t change how the engine runs. Monte carries a calibration for your exact engine: it adjusts fuelling and ignition timing (and boost on turbo engines), and you can unplug it any time to go back to stock.

Monte makes no permanent change: it does not rewrite the factory ECU software, so unplugging the device returns the car to its original behaviour. Dealer policies vary, and removing the module before service is the standard, conservative practice. We cannot promise how an individual dealer will react.

Eco mode targets up to 5% lower consumption in steady, light-throttle driving. That figure is our target, not yet independently measured — the calculator on this page uses it and says so. Your result depends on the car, the route and your right foot.

It should not: Monte stays within factory sensor ranges and does not disable any system. In the SEMA Garage test no codes were set. If a light ever appears, unplug the device — the car returns to stock instantly — and contact us.

You will feel the sharper response right away. The ECU then finishes adapting its fuel trims and timing over roughly 120 miles (200 km) of normal driving — several trips, not one long one — and that is when the full gain is in.

Yes to both. Unplug it and the car is stock immediately, no reflash, no dealer visit. As the original owner you can reprogram the car tuner for another compatible car — GT through the app, GTR through the desktop tool — at no extra cost.

GT is ECU tuning controlled from the Monte app. GTR is the same tuning on its own touch screen, plus live gauges, a scan tool that reads and clears codes, an acceleration timer and a virtual dyno. If you only want the tune, GT. If you want to see what the car is doing, GTR.

A throttle controller only changes how sensitive the pedal is — the engine makes the same power. ECU tuning changes the calibration itself: timing, fuelling and torque management. That is where measurable horsepower and torque come from, and why a throttle controller feels quicker without being faster.

No. Keep the fuel grade and service schedule your manufacturer specifies. Higher octane may help slightly in Performance modes but is not required.

Lifetime warranty against manufacturing defects, for the original buyer: we repair the device or replace it with a new one. Inside the US one postage fee covers both labels — to us and back — and both are tracked; from abroad you ship it to us at your own cost and the return trip is free. Thirty-day money back: return within 30 days of delivery for a full refund, with a prepaid label inside the US and buyer-paid postage from abroad. Free shipping worldwide from Little Rock, Arkansas — UPS inside the US, UPS Express or DHL abroad: US orders arrive in 2–4 business days, Canada and Europe 3–7, elsewhere 5–10. Import duties may apply outside the US.