Monte GT · Monte GTR
Plug-in ECU tuner, calibrated for your car
A car tuner that plugs into your OBD-II port and carries a calibration for your engine and year. No ECU flash: unplug it and the car is back to stock.
From $279 · Free UPS shipping
Calibrated for your engine · 30-day returns · Limited lifetime warranty
How a plug-in tuner works. No flash, no shop.
Calibrated for your engine
A calibration made for your exact engine and year.
Plugs into OBD-II
The port is under the dash. No tools, no wiring, about five minutes.
Unplug, and it’s stock
Monte does not rewrite the ECU’s permanent memory. Take it out and the car is as it left the factory.
*Real-world results may be less or more: they depend on the engine, fuel, altitude and how the car is driven.
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.
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.
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.
Ford F-150 Raptor3.5 EcoBoost · 2019 · GT / GTR
+21hp+31lb-ft
SEMA GarageLab test · Diamond Bar, CA
Ford F-150 Raptor
3.5 EcoBoost · 2019 · GT / GTR
SEMA GarageRace II, fifth gear, each trace the average of three separate dyno runs. Best gain 21 hp and 31 lb-ft, both 8%, at 51 mph. Measured at SEMA Garage, September 2023.
Mercedes C3002.0 turbo · Monte GT / GTR
+25.1hp+72.2lb-ft
Car News · YouTubeDyno on video
Mercedes C300
2.0 turbo · Monte GT / GTR
Car News · YouTubeFilmed before and after on the same dyno
Abarth 5951.4 T-Jet · Monte GT / GTR
+20.6hp+13.7lb-ft
Abarth owner · UKDyno on video
Abarth 595
1.4 T-Jet · Monte GT / GTR
Abarth owner · UKTwo runs in one session on a certified insoric system — stock first, then with Monte. August 3, 2020, 63 °F, 28.6 inHg, third gear, corrected to ECE 80/1269.
Nissan 370Z3.7 V6 · 2014 · Monte GT / GTR
+22.3hp+16.8lb-ft
CircuiTek · New TaipeiDynocom customer dyno report
Nissan 370Z
3.7 V6 · 2014 · Monte GT / GTR
CircuiTek · New Taipei325.6 → 347.9 hp, stock and fitted back to back on the same dyno. The car runs an aftermarket exhaust (mid and rear section). Our own test.
Mazda MX-52.0 · Monte GT / GTR
+16.6hp+17.1lb-ft
CircuiTek · New TaipeiDynocom customer dyno report
Mazda MX-5
2.0 · Monte GT / GTR
CircuiTek · New TaipeiBest gain, both 11.8%, at 5100 rpm: 140.5 → 157.1 hp and 144.7 → 161.8 lb-ft. Peak to peak the same run reads 156.2 → 163.4 hp. Corrected to SAE J1349.
Designed in the USA · Ships from Little Rock, Arkansas
Two tuners. Pick yours.
Monte GTR
Tuning, diagnostics and testing on one screen.
Monte GT
Everyday tuning, controlled from your phone.
Subject to eligibility and approval. Payment options through Affirm are provided by these lending partners: affirm.com/lenders
Frequently asked questions
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
Your is on the list.
The calibration is already written — it goes into the device before it ships.
