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Free UPS shipping · 30-day returns · Limited lifetime warranty$399
Monte GTR

Designed in the USA · Ships from Little Rock, Arkansas

Monte GTR

Tuning, diagnostics and testing on one screen.

$399or 4 interest-free payments of $99.75 with Affirm

Calibrated for your engine · 30-day returns · Limited lifetime warranty

Monte GTR. In action.

Watch full video0:27

Monte GTR

Everything on one screen. Right from the driver’s seat.

Using it as an OBD2 gauge display →
1 code foundP0455EVAP system, large leak — often a loose gas cap.
0 codesClearedCodes cleared. The light is off.
Monte GTR feature

Your car speaks in codes. Monte GTR translates.

Monte GTR reads Check Engine codes, tells you what they mean and clears them — right on its screen. No separate scanner needed.

What the tune adds

+??hp

Pick your car and we’ll show the factory figures and what the calibration adds.

See your gain. Before you buy.

Type your car — we’ll show what Monte adds to its engine.

Prefer picking? Choose from the list

Monte GTR$399

* “With Monte” figures are estimates calculated from manufacturer ratings, not measurements. Results vary by vehicle, engine condition, fuel, climate and driving; individual results may be lower.

Why results vary

Estimated from the factory figures for this engine — not a measurement of your car. Real-world gains may be less or more, depending on a large number of contributing factors: displacement, aspiration, fuel, altitude, the condition of the engine and how the car is driven.

Real Results from Real Drivers

Estimated Measured.

Every power figure here comes from a chassis dyno run you can watch or read. Where there was no dyno, we say so.

CarGainMeasured by
Ford F-150 Raptor Ford F-150 Raptor3.5 EcoBoost · 2019 · GT / GTR +21hp+31lb-ft SEMA GarageLab test · Diamond Bar, CA
Mercedes C300 Mercedes C3002.0 turbo · Monte GT / GTR +25.1hp+72.2lb-ft Car News · YouTubeDyno on video
Abarth 595 Abarth 5951.4 T-Jet · Monte GT / GTR +20.6hp+13.7lb-ft Abarth owner · UKDyno on video
Nissan 370Z Nissan 370Z3.7 V6 · 2014 · Monte GT / GTR +22.3hp+16.8lb-ft CircuiTek · New TaipeiDynocom customer dyno report
Mazda MX-5 Mazda MX-52.0 · Monte GT / GTR +16.6hp+17.1lb-ft CircuiTek · New TaipeiDynocom customer dyno report

Which tuning fits your car? Three ways, side by side.

Three ways to change how an engine responds — what each one involves, and what it costs you later.

Monte
ECU flash
Installation
Monte
Plugs into OBD-II. 5 min, no tools.
ECU flash
Shop rewrites the ECU. 1–3 h.Wired under the hood. 1–2 h.
Reversibility
Monte
Unplug. No ECU changes.
ECU flash
Re-flash to stock; counters may remain.Unplug and restore the wiring.
Power gain
Monte
Moderate. Dyno-tested — see Real Results.
ECU flash
Largest — the ECU map is rewritten.Moderate; mostly turbo engines.
Moves to your next car
Monte
Yes — set it up on your next compatible car.
ECU flash
No — one ECU, pay again.Rarely — model-specific harness.
Price
Monte
From $279. No labour.
ECU flash
$500–1,500 + labour, typical. Monte saves you $221–1,221.$300–900, typical. Monte saves you $21–621.

Five points buyers ask us about most — not every way to compare.
Flash and piggyback figures are typical market ranges, not our measurements, so the saving is the arithmetic on those ranges against the $279 Monte GT — not a quote. Monte figures come from dyno tests — see Real Results.

Real feedback from customers

≈20hp

Kia Stinger GT

“about 20 hp” · owner’s estimate

Noticeable

Amazon.ca buyer

“a little more get up and go”

5min

Amazon.ca buyer

“very simple to set up”

Shocked

1997 Mazda B2300

“Definitely gave it a boost”

Huge

Canada · Sport 2 mode

“the sport 2 mode is a lot of fun”

Results as reported by the owners. Experiences vary by vehicle, driving conditions, and selected mode.

“A gain of about 20 hp on a Kia Stinger GT.”

Translated from French

I tried this chip without any expectations. A gain of about 20 hp on a Kia Stinger GT. Power comes in faster, with a better kick on gear changes. I noticed the difference after about 50 km... I finished the 200 km on Race Max and I'm very satisfied. I recommend it.

Original: J'ai tenté l'essaie de cette chip, sans avoir aucune attente. Un gain d'environ 20hp pour un kia stinger gt. Puissance arrive plus vite et meilleur kick lors de changement de vitesse. J'ai remarqué la différence après environ 50 km... j'ai terminer les 200km à race max et très satisfait. Je recommande

R
Roxane
Amazon CanadaMay 31, 2024
“This tuning chip has made a very nice and definitely noticeable difference in the throttle response as well as top end before gear changes, plus an almost 40 more ponies to play with!!!!”

This tuning chip has made a very nice and definitely noticeable difference in the throttle response as well as top end before gear changes, plus an almost 40 more ponies to play with!!!! I would definitely recommend this if you’re looking for a little more get up and go at a reasonable price! I haven’t tried the gas saving feature yet so I’ll come back to you in a few months when the weather gets colder. I’m just enjoying the extra get up and go right now while the weather is nice. Setup was also very easy and went without a problem.

B
BigTim
Amazon CanadaAugust 26, 2025
“clear instructions to walk you through the 5 minute setup.”

this is a great product to add performance
 and most importantly increases your fuel milage. very simple to set up and calibrate. clear instructions to walk you through the 5 minute setup. they have a good customer service as well. i spoke with Eugene and he was very helpful.

S
Shaun
Amazon CanadaJuly 28, 2025
“Definitely shocked with the difference it made in the truck, used in my 1997 Mazda b2300.”

Definitely shocked with the difference it made in the truck, used in my 1997 Mazda b2300. Definitely gave it a boost

J
John
Amazon CanadaJune 21, 2025
“Noticed a huge improvement in acceleration, negligable increase in feel consumption.”

Halfway through the calibrating for Sport 2 mode, pretty satisfied so far. Noticed a huge improvement in acceleration, negligable increase in feel consumption. Haven't tried feel saver yet, good chance I may never try it as the sport 2 mode is a lot of fun and had way less negative impact on feul than I anticipated

P
Paul
CanadaJanuary 7, 2026
Installing Monte GTR car tuner device

Installs in minutes. Unplugs as easily.

The OBD-II port is under your dash. No tools, no wiring, no ECU flashing.

01
Plug Monte into the OBD-II port
02
Pick your car in the GTR Programmer
03
Drive. Unplug any time to go back to stock

Works with OBD-II cars — US 1996 and newer, EU 2001 and newer.

Watch installation guide
Watch installation guide

Boost your car with Monte GTR

Monte GTR$399
$399
or 4 interest-free payments of $99.75 with

Subject to eligibility and approval. Payment options through Affirm are provided by these lending partners: affirm.com/lenders

Performance tuning
Fuel economy tuning
Touchscreen controlled
Vehicle diagnostics
Acceleration meter
Virtual dyno

What’s in the box?

Monte GTR · OBD2 cable, 5 ft · Magnet mount with suction cup · USB cable

Calibrated for your engine · 30-day returns · Limited lifetime warranty

Tech specs

PerformanceUp to 20% more power on turbocharged engines*Up to 12% more power on naturally aspirated engines*Economy modes for steady, relaxed driving
ModesRace, Race Plus, Race Max, Sport, Sport Plus, Economy, Economy PlusTuning off: factory settings120-mile adjustment in each mode
ScreenTouch screen displayLive gauges: a fixed dial and four cells you chooseScan tool: read and clear fault codes0–60 timer and virtual dyno
Connection16-pin OBD-II cable to RJ45, 5 ftUSB for programming from a computer
SoftwareGTR Programmer in your browserTuning database for your exact vehicle
HardwareOperating temperature: −40 to +85 °C (−40 to +185 °F)Operating voltage: 7.5–20 V
Warranty30-day money-back guaranteeLimited lifetime warranty on defects
Dimensions121 × 76 × 25 mm4.8 × 3.0 × 1.0 in
What’s in the box?
Monte GTR
OBD2 cable, 5 ft
Magnet mount with suction cup
USB cable

*Real-world results may be less or more.

Why results vary

It depends on:

  • Engine size
  • Turbocharged or naturally aspirated
  • Fuel quality
  • Altitude
  • Engine condition
  • How the car is driven
Need it without a screen? Monte GT · $279 →

Buy with confidence. We’ve got you covered.

Free shipping. Worldwide from Little Rock, Arkansas.

30 days to try it. Not the right fit? Full refund.

Limited lifetime warranty. Manufacturing defects, for the original buyer.

Frequently asked questions

Check the catalogue: make, model, year and engine. Monte GTR works on cars with an OBD-II port — in the US from 1996, in Europe from 2001 — but each engine needs its own setting, so not every car is listed yet. Browse supported cars →
It tunes the engine through the OBD-II port and puts everything on its own touch screen: seven modes, live gauges, a scan tool for fault codes, a 0–60 timer and a virtual dyno. The factory ECU software is left as it is.
It depends on the engine. Up to 20% on turbocharged engines, up to 12% on naturally aspirated ones and up to 10% on hybrids — measured against the combined output of engine and battery, because a tune works on the combustion engine only. Real-world results may be less or more: engine size, fuel quality, altitude, engine condition and how the car is driven all play a part.
The Economy modes are made for steady, relaxed driving. How much fuel they save depends on the car and how it’s driven — we don’t quote a figure until we’ve measured it.
Race, Race Plus and Race Max are for dynamic driving, with Race Max giving the most performance. Sport and Sport Plus are a mix: some more power, some fuel saved. Economy and Economy Plus are for fuel efficiency, with no loss of power. Each mode has its own profile and its own adjustment. The tuning switch on the screen puts the car back on its factory settings.
A mode is live as soon as you select it, and the GTR refines it over roughly 120 miles (200 km) of normal driving — the ADJ percentage on the home screen shows how far it has got. Progress is saved when you switch the engine off and carries on next time, ten miles or a hundred at a time. Switch to another mode and its own adjustment begins.
Yes, if you chose your exact car when you ordered: it arrives ready to plug in. If you did not, write your car to it yourself: sign in to your Monte account with the order email, open GTR Programmer in Chrome, Edge or Opera on a computer, connect the GTR with a micro-USB data cable, then choose make, model, year and engine and write it. No computer at hand? Tell us and we will program it for you.
Yes. Write the new car to it in GTR Programmer in your Monte account (in the browser on a computer) — or tell us and we will do it — then plug it in and let the mode run its 120 miles. Selling the car? Take the GTR with you.
Tell us the make, model, year and engine. We build the file for your car, normally within three business days.
Live gauges: a fixed dial with coolant temperature, rpm, speed and battery voltage, plus four cells you fill yourself — boost, fuel pressure, throttle angle and more. The screen can only show what your car’s ECU reports, so some readings may be missing on some cars.
Yes. The scan tool reads the fault codes your car has stored and clears them. Clearing removes the record, not the cause: if the fault is still there, the code comes back.
The timer starts by itself when you pull away and stops at the target speed. The dyno measures power and torque as you pull through the revs in second gear, from the engine data your car reports; runs are saved and can be laid over each other. It is made for comparing runs, not for certified figures. Run tests only on a closed track, never on public roads.
The factory ECU software is left as it is, and the factory safeguards stay active. Like any tune, the performance modes add load — use them as intended, and keep the fuel grade and service schedule your manufacturer specifies.
No — installing an aftermarket part doesn’t void your car’s warranty by itself; that’s US federal law (the Magnuson-Moss Warranty Act). Monte doesn’t rewrite the factory software, and unplugging it puts the car back on its factory settings. Warranty repairs are always the dealer’s decision.
The factory software was never changed, so the car is back on its factory settings. The same happens if you switch tuning off on the screen.
It stays plugged in — that is how it keeps tuning and showing data. Parked, it goes to sleep and wakes when you start the car. If it does not sleep or wake properly on your car, change the wake-up setting to ECU or VOLT; plug-in hybrids use Hybrid.
Stick the suction mount on the windshield where it does not block your view. With the ignition off, push the 16-pin end of the cable into the OBD-II socket under the dash on the driver’s side, plug the RJ45 end into the back of the GTR and start the car. Use the port on its own — never through a splitter.
Yes. Monte GTR works with gasoline and diesel engines, including turbo-diesels, and with many hybrids. Check your exact engine in the catalogue before you buy. Browse supported cars →
Yes. The GTR tunes the engine and nothing in the gearbox, so it works with manual, automatic, dual-clutch (DSG) and CVT transmissions alike.
Yes. A throttle controller only changes how the pedal is read; Monte GTR tunes the engine itself. They work on different systems, so they can be used together.
No. Use the fuel grade your manufacturer specifies. Higher octane may help a little in the performance modes, but it is not required.
Both tune the engine. Monte GT is set from the Monte app on your phone. Monte GTR has its own touch screen with live gauges, a scan tool, a 0–60 timer and a virtual dyno. If you only want the tune, GT. If you want to see what the car is doing, GTR.
Unplug the GTR. If the light stays, it is the car, and it wants looking at either way. If it goes out, write to us with the serial number (type bigSn in Settings → Advanced), your car and a photo of the screen.
No. Monte tunes the engine and switches between its own modes — nothing else. It doesn’t remove the top-speed limiter, doesn’t turn off stability control, traction control, ABS or other safety systems, and doesn’t change lighting, tire size or speedometer calibration.

Does Monte fit your car? Check by make and model.

Pick your car and the answer comes straight from the calibration list — no form, no waiting for a reply.

Prefer picking? Choose from the list

Monte Tuning female technical support specialistMonte Tuning male technical support specialist
Need help choosing?
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