Engine Rebuild & Repair
Engine Rebuild & Repair
Having engine issues ? We rebuild and repair engines.
Get tuned
Custom tunes, developed on the dyno.
We recalibrate fuel, ignition, boost and throttle against maps built for your exact engine — and archive your factory file so stock is always one flash away.
Two ways to get tuned
Whichever you pick, you keep your factory file and you keep your warranty position.
Remote Tuning Procedure
How tuning actually works
Featured
What most people buy
GPEC2A TUNER - 2015 - 2024 CHRYSLER/DODGE/JEEP/RAM
GPEC2A Tuner Read, Adjust & Flash Your Own Vehicle — From Home 2015+ Dodge · Chrysler · Ram · Jeep | Continental GPEC2A ECU The GPEC2A Tuner by Custom Tunez gives vehicle owners and…
GPEC2 TUNER - 2012 - 2014 CHRYSLER/DODGE/JEEP/RAM
GPEC2 TUNER Read, Adjust & Flash Your Own Vehicle — From Home 2012–2014 Dodge · Chrysler · Ram · Jeep Continental GPEC2 ECU The GPEC2 Tuner by Custom Tunez gives vehicle owners and…
Speak to an engineer
Tell us about your car
Leave your details and one of our engineers will call you to talk through the best option for your car — not a salesperson.
Prefer to talk now? +1 833-450-5318
What your car gets
- Optimised fuel map
- Optimised ignition map
- Smoother idle
- Sharper throttle response
- One-time tune for life — no retuning
- Manufacturer warranty stays valid
- Tool-free install in minutes
- Installation phone support line
A tune isn't finished until you're happy with how the car drives. If something isn't right, we keep working on it — that's been the standard on every car we've done.
Most customers also see a longer range on the same tank — up to 200 km more in the city and 350 km more on the highway. Varies by vehicle, fuel quality and driving style.
Let's talk about numbers
Your car's numbers
Pick your vehicle and see what Stage 1 and Stage 2 do before you spend anything.
Pick your vehicle to see stock and tuned figures. Not listed? We build calibrations to spec — talk to an engineer.
How it works
The same four steps on every car, whether it's on the bench in Ontario or flashed remotely on the other side of the world.
Health Check
Full scan of the ECU and drivetrain before a single byte is touched. If the car isn't mechanically healthy, we say so first.
Read Out
Original calibration is read and backed up. Your factory file is archived so a return to stock is always one flash away.
Remap
Fuel, ignition, boost, torque limiters and throttle mapping recalibrated against dyno-developed base maps for your exact engine.
Flashing
The finished calibration is written to the ECU — over OBD, over the bench, or remotely with the CTZ Flasher.
Cars we've tuned
See all →Mustang EcoBoost 2.3 2018
Stage 2 · Crackle tune
Dodge Challenger R/T
Stage 2 · HEMI
Mercedes-Benz C400 2017
Stage 1 · Pops & bangs
Common questions
Anything not here, call us — +1 833-450-5318.
Will tuning void my manufacturer warranty?
Our calibrations are written to keep the vehicle inside manufacturer specification — nothing is pushed past what the hardware was designed to survive, and a back-to-stock file is archived for every car we touch. That said, warranty outcomes are decided by your dealer, not by us, so speak to them if warranty coverage is critical to you.
Do I ever need to be re-tuned?
No. It's a one-time tune for life. If you add hardware later and want the calibration revised, talk to us — but the tune itself doesn't expire or need renewing.
How does the Shipout Method work?
You send your VIN and a photo of the ECU label. We build and ship a pre-tuned ECU. You unplug the old one, plug the new one in — minutes, no tools — and send the original back with the label included in the box. Zero downtime.
What is the CTZ Flasher?
A handheld ECU programming tool controlled from an iOS or Android app. It reads and writes your ECU at home, stores multiple profiles, clears trouble codes and returns you to factory with one tap. The tool and the tune are sold separately.
Can I go back to stock?
Always. Your original calibration is read out and archived before anything is written. Back-to-stock is one flash away, whether you do it yourself on the flasher or send it to us.
Do you really improve fuel economy?
On most vehicles, yes — customers report up to an extra 200 km in the city and up to 350 km on the highway per tank. Results vary by vehicle, fuel quality and how you drive it. If you spend the extra torque instead of saving it, your mileage won't improve.
Which vehicles do you support?
22 marques and counting — the Chrysler group in depth, plus BMW, Mercedes-Benz, Audi, VW, Porsche, Ford, GM, Toyota, Lexus, Nissan, Infiniti, Hyundai, Kia, Mazda, Honda, Acura, Jaguar and Land Rover. If yours isn't listed, send a Special Tune Request.
Let's build your calibration
Free consultation. Tell us the car, the mods and what you want out of it.