Stage 1, Stage 2 and Stage 3 Tuning Explained

What does "stage" mean?

"Stage" is shorthand that tuners use to describe how far a car has been changed from factory. The higher the number, the more has been done.

It is a helpful label, not a standard. Each tuner and each platform (a family of cars that share the same engine and computer) uses the terms a little differently. When we quote a stage package, we list exactly what is included for your car so there is no guessing.

What is Stage 1?

Stage 1 is usually a tune only. Your car keeps all its factory parts, and the engine computer gets new instructions that use some of the safety margin the factory left in place. You can read more about that in our guide to what ECU tuning is.

What it usually involves: a custom calibration for the engine computer, and sometimes the transmission computer too. No parts change.

Who it is for: most daily drivers. If you want a car that feels stronger and more responsive without changing how it looks, sounds or behaves day to day, Stage 1 is the usual starting point. It is also the easiest stage to undo on most cars, because nothing physical has changed.

What is Stage 2?

Stage 2 builds on Stage 1 by adding parts that help the engine breathe in and out more easily, then tuning to match those parts.

What it usually involves: some mix of the following, depending on the car:

• An intake, which is the pipe and filter that bring air into the engine.
• A downpipe, which is the section of exhaust right after the turbo. Aftermarket downpipes often change or remove parts of the emissions system, which matters for legality. More on that below.
• An intercooler, which cools the air coming out of the turbo before it goes into the engine. Cooler air is denser and helps protect the engine.
• Sometimes an upgraded exhaust or other supporting parts.

Who it is for: drivers who enjoy the car and want more than Stage 1, and who are fine with a louder car, more frequent maintenance and some extra cost. On many cars, Stage 2 parts are designed for off-road or track use, and we will tell you up front where that applies.

What is Stage 3?

Stage 3 usually means changing major hardware, most often a larger or upgraded turbocharger (a turbo is a fan driven by exhaust gas that pushes extra air into the engine). Because a bigger turbo moves much more air, other parts often need to keep up.

What it usually involves: an upgraded turbo or turbos, plus whatever the car needs to support it. That can include fuel system parts, cooling upgrades, transmission work and sometimes internal engine parts. The list is very different from car to car.

Who it is for: committed enthusiasts who accept that the car becomes more of a project. Stage 3 costs more, takes longer to install and needs closer attention afterward. It is not the right choice for someone who mainly wants a reliable commuter with a bit more punch.

Why do stages vary by car?

Every engine has different strengths and weak points. One car may make a big jump from Stage 1 alone. Another may need a downpipe before the tune can do much. Some cars have a transmission that needs its own tune before the engine can safely make more power.

That is why we do not sell stages as a fixed menu. Our performance work covers Stage 1 to Stage 3 packages, sourcing and installing the hardware, and platform-specific recommendations, meaning advice based on what actually works on your engine. We select parts around your car, your goals and anything already modified.

How much power does each stage add?

It depends on the car, the fuel, the parts, the condition of the engine and the stage. We do not quote horsepower numbers before we know your car, and you should be careful with anyone who does.

If you want to see what is possible, the Eurocharged network shares dyno results for some cars on eurocharged.com. We tune with the same Eurocharged calibrations, and your own results will depend on your car.

Are higher stages legal for street use?

Some modifications, especially those that change or remove emissions parts, are only meant for off-road or track use. Georgia also requires emissions testing for most gas cars registered in 13 metro Atlanta counties. We will tell you which parts apply to your car and what to consider before you choose.

Which stage is right for me?

Start with what you want from the car, not with the number. Tell us how you use it and what is already done to it. We will recommend the stage that fits, and we will tell you if a lower stage gets you most of the way there.

Send us your year, make, model and any current modifications, and we will quote the stage that fits your car.