Kia Stinger & Genesis Tuning by 3.3T Specialists
Real, streetable power for the Kia Stinger and Genesis G70/G80 — flashed remotely from your driveway with an EK1, or in person in the DFW or Houston area. Backend Flash from $189, Custom Tune $499, TCU Tune $395.
ECU tuning
Choose your tune: Backend Flash vs Custom Tune
Two ways to tune your ECU. Already running a JB4 or ProTuner piggyback? The Backend Flash pairs with it. Want everything handled inside the ECU with no piggyback at all? That's the Custom Tune.
Backend Flash
An ECU flash that pairs with your JB4 or ProTuner piggyback — the piggyback handles boost while the flash dials in fueling, ignition timing, cam timing, and raised torque limits.
- Works with ALL JB4 maps
- Optimized fueling, ignition & cam timing
- Raised torque limits
- Supports stock AND hybrid turbos
- Optional pops & bangs
- Optional JB4 Map 6 support
- Start/stop disable
Up to 540 WHP on stock turbos (meth/CPI) — a JB4 or ProTuner piggyback is what unlocks the full power, since the flash doesn't control boost on its own.
Custom Tune
A complete ECU tune — everything handled inside the factory ECU, no piggyback required. Full boost control, fueling, timing, and cam strategy calibrated to your goals, with full safety integration.
- No JB4 or ProTuner needed
- Full boost control inside the ECU
- Calibrated to your goals
- Supports stock AND hybrid turbos
- Full safety integration
Up to 540 WHP on stock turbos and up to 680 WHP on hybrid turbos.
Transmission
TCU Tuning
The other half of the drivetrain. A TCU tune sharpens how your transmission puts the power down — sold separately from the ECU tunes.
Your platform
Find your car
ECU tunes start at $189 across every supported platform. Pick your car to configure your tune.
Delivery
How your tune gets onto the car
Most customers flash remotely from their driveway with an EK1 — or visit us for in-person flashing while you wait.
EK1 Remote Flash
FreeThe EK1 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.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.
Power expectations
What you can expect on the 3.3T
Power scales with your fuel. Typical wheel-horsepower figures on stock turbos — for the Backend Flash, a JB4 or ProTuner piggyback is what unlocks these peak numbers. Your exact figures depend on mods, fuel quality, and conditions.
Why SleepyTuned
Tuned by 3.3T specialists
FAQ
Common questions
Which vehicles do you support?
ECU tunes for the Kia Stinger (3.3T and 2.0T) and Genesis G70 (3.3T and 2.0T) and G80 (3.3T), plus a TCU tune for the Kia/Genesis 3.3T.
Backend Flash or Custom Tune — which do I need?
If you already run (or plan to run) a JB4 or ProTuner piggyback, the Backend Flash ($189) pairs with it — the piggyback handles boost, the flash dials in fueling, timing, and torque limits. If you don't want a piggyback at all, the Custom Tune ($499) handles everything — including full boost control — inside the factory ECU. Still unsure? Read Backend Flash vs full ECU tune.
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. It is not included and is sold separately — SleepyTuned does not sell or provide the EK1. If you don't have one, choose in-person flashing instead.
How is the tune delivered?
Two ways: EK1 remote flash (free — device sold separately) or in-person flashing (+$150) in the DFW or Houston area, typically 60–90 minutes.
How much power will I make?
On the 3.3T with stock turbos: about 420 WHP on 91 octane, 440 WHP on 93, 460–480 WHP on E30, and up to 540 WHP with meth/CPI — the Backend Flash relies on your piggyback to reach those peaks. The Custom Tune supports up to 680 WHP on hybrid turbos. Above 480 WHP we recommend upgraded head studs.
Is it safe for a daily driver?
That's the whole point. Every tune is built with reliability in mind, you get direct tuner support to dial it in, and your purchase is satisfaction-backed — we issue a refund if we genuinely can't resolve your concerns.
Learn more
From the knowledge base
Ready to wake up your car?
Join 1000+ tuned cars. Pick the tune that fits your setup and we'll get you dialed in — with direct tuner support every step of the way.