SleepyTuned started with a car I loved and an experience I didn’t. I owned a 3.3T, I chased more out of it, and I did what most owners do — I paid a bigger shop and waited. What I got back was a generic file, slow replies, and the feeling that I was a transaction, not a customer. I wanted someone who actually knew this platform and actually gave a damn. I couldn’t find them.
So I stopped waiting. I learned to tune the Lambda 3.3T myself — the hard way, on my own car, reading the ECU instead of guessing at it. I obsessed over how this engine and transmission actually behave, tested everything before I trusted it, and slowly became the tuner I wish I’d hired in the first place.
That’s the whole idea behind SleepyTuned: build the shop I couldn’t find. Honest numbers, real support from someone who runs these same files on his own car, and tunes made for owners who love this platform as much as I do. You’re not a number here — you’re the reason any of this exists.
We specialize in the Kia Stinger and Genesis G70/G80 3.3T — one platform, tuned properly, instead of a little bit of everything tuned generically. Here’s what that focus buys you.
Flagship
TCU transmission tuning
Our transmission (TCU) tune is where we go deepest. Faster, sharper shifts, gears held where you want them, and a car that finally behaves the way a 3.3T should — the kind of transformation almost no one else on this platform does well.
Delivered remote
Remote EK1 flashing
With an EK1 plugged into your OBD2 port, we flash your ECU from anywhere — no shipping your car, no mail-in ECU, often same day. You stay in your driveway; the tune comes to you.
No snake oil
Honest numbers only
We publish real, tested estimates and label them as estimates — never inflated dyno fantasies. If a figure needs meth, upgraded turbos, or the right fuel, we say so up front. You should know exactly what you’re buying.
How it works
Order, build, delivered
No mailing your ECU, no guesswork. From checkout to a flashed car, the whole process is built to be simple and fast.
1
You order
Pick your tune, tell us about your car, mods, fuel, and goals. Not sure what fits? Message us first — we’d rather point you to the right option than sell you the wrong one.
2
We build it
Your file is calibrated for your setup on a platform we know inside and out — tested and refined before it ever touches your car. Real support the whole way, from the person who tuned it.
3
Delivered to your device
With an EK1 in your OBD2 port, our automated delivery engine flashes the finished tune straight to your car — remotely, often the same day. Need a change later? Revisions are handled through support.
In their words
Real owners, real cars
We don’t write these — our customers do. A few from owners who let us share their words and handles.
“Christian is the man when it comes to these 3.3 and custom tunes… the difference was night and day. Been running his E-40 tune 40k+ miles with no hiccups and just the proper maintenance.”
@slow.g80Genesis G80 · E40 Custom Tune
“My Stinger is far superior on sleepy’s full E30 ECU flash compared to the stock tune! Car feels like it delivers power smoother and just runs healthier overall. Oh yeah and it’s wayy faster lol. Would 10/10 buy his tune if you’re on the fence.”
@gt1_benKia Stinger · E30 Full ECU Flash
“Best tune for the Stinger & Genesis platform! My Stinger GTS now performs the way it looks — FAST! SleepyTuned changed the game for the KDM platform.”
@dark.rseKia Stinger GTS
Testimonials shared with each owner’s permission. Individual results vary with vehicle, modifications, and fuel.
Our Mission
Tuning with Purpose, Backed by Research
Our mission is to support the 3.3T community with thoughtful, well-tested tuning that puts safety, reliability, and real performance first. We spend countless hours researching and refining every strategy on our own cars before it ever reaches yours — not because it’s profitable, but because we care about pushing the platform forward the right way. We share what we learn openly and back it with honest support, instead of building walls around it. This isn’t just about making fast cars faster — it’s about building something better for everyone who drives them.
The G70 that started it all
Why owners trust us
A real shop, not a black box
Real people, real supportWhen you message us, you’re talking to the people who actually build your tune — not a ticket queue that forgets you after checkout. Revisions and questions are handled by name.
Tested before you trust itWe research and refine on our own cars first. Nothing ships until it’s proven safe and reliable on the platform — because we have to live with these tunes too.
No hype, no snake oilHonest estimates, clear about what each tune needs, and upfront about what your car will and won’t do. If something isn’t right for you, we’ll tell you.
One platform, done rightThe Kia Stinger and Genesis 3.3T are all we do. That focus is why owners across the community trust us with their cars.
