Custom Tune
A complete, standalone ECU tune for your Kia Stinger or Genesis 3.3T — no piggyback required. We take full control of boost, fueling, timing, and cam strategy and calibrate it around your exact goals, setup, and the way you want the car to feel.
What it is
Full ECU control, calibrated to your car
A Custom Tune is a complete ECU flash that directly controls fueling, ignition timing, cam timing, torque limits, and boost pressure — without the need for a piggyback system. The ECU manages every aspect of engine performance natively, which means smoother power delivery, sharper response, and the tightest possible integration with the factory safety systems. We use your logs to make sure the car is as happy as possible for your exact setup.
This is for you if…
You want maximum power with full boost control, you don't want to run a piggyback, you're on stock or hybrid turbos, or you want a tune dialed-in to your exact power, response, and feel goals.
Consider a Backend Flash instead if…
You already run a JB4 or ProTuner, you're happy letting it handle boost, and you just want a quick, safe daily power bump at a lower price.
What's included
Everything in your Custom Tune
- Max power calibration for your setup
- Custom boost control & target tables
- Aggressive ignition timing strategy
- Supports stock & hybrid turbos
- Optional pops & bangs, burbles
- Dialed in to your exact power & feel goals
Power expectations
From daily-safe to all-out
With full boost control, the Custom Tune pushes stock turbos to their ceiling and unlocks serious numbers on hybrids. These are typical wheel-horsepower figures on stock turbos — your exact numbers depend on mods, fuel, and conditions.
How we tune
Your goals, your tune
Whether you want maximum performance or maximum safety margin, we calibrate to your priorities. With full ECU control, every safety system — knock protection, fuel safety, and thermal limits — responds in real time to the exact power being made. That's the advantage of a fully integrated tune, and it's why a Custom Tune delivers the smoothest, safest power on the platform.
Delivery
How your tune gets onto the car
Choose the flashing method that fits you best. Most customers flash remotely from their driveway with an EK1, or grab a pre-flashed Spare ECU for true plug-and-play with zero downtime.
EK1 Remote Flash
FreeFlash from home using the EK1 device — it plugs into your OBD2 port and lets us flash your ECU remotely from anywhere. No shipping, no appointment.
The EK1 device is required and sold separately. SleepyTuned does not sell or provide the EK1 — the tune does not include one.Spare ECU (Plug & Play)
+$499We ship you a pre-flashed, plug-and-play spare ECU with your tune already loaded. Swap it in and go — and keep your stock ECU as a backup so you can revert to stock anytime.
In-Person Flashing
+$150Visit one of our locations (DFW or Houston area) and we'll flash your ECU while you wait. Typical appointment is 60–90 minutes.
Choose your flashing method
EK1 device required — sold separately. SleepyTuned does not sell or provide the EK1 device.
Why SleepyTuned
Tuned by 3.3T specialists
FAQ
Common questions
Do I need a JB4 or piggyback for the Custom Tune?
No. The Custom Tune is a standalone ECU tune with full boost control built in — no JB4, ProTuner, or any piggyback required. The ECU controls everything natively.
What is the EK1, and is it included?
The EK1 is a remote flashing device that plugs into your OBD2 port so we can flash your ECU from anywhere — no shipping or appointment needed. It is not included and is sold separately. SleepyTuned does not sell or provide the EK1 device. If you don't have one, choose in-person or a pre-flashed Spare ECU.
How much power can I make?
Up to 540 WHP on stock turbos and up to 680 WHP on hybrids. On stock turbos, expect roughly 420 WHP on 91 octane, 440 WHP on 93, 460–480 WHP on E30, and up to 540 WHP with meth/CPI. Above 480 WHP we recommend upgraded head studs.
Does it support hybrid turbos?
Yes. The Custom Tune supports both stock and hybrid turbos, with custom boost control and target tables calibrated to your specific setup — up to 680 WHP on hybrids.
How do I get the tune onto my car?
Three ways: EK1 remote flash (free, device sold separately), in-person flashing (+$150), or a pre-flashed plug-and-play Spare ECU (+$499) that you simply swap in.
Ready for a tune built around your car?
Join 1000+ tuned cars. Pick your flashing method at checkout and we'll dial in a Custom Tune to your exact goals — with direct tuner support every step of the way.