Thinking about a 2013 WRX turbo upgrade is basically a rite of passage for owners who've gotten a little too used to that factory boost kick and want something that actually pulls all the way to redline. The stock VF52 turbo isn't a bad unit by any means—it's punchy and wakes up early—but it definitely runs out of breath once you start pushing the car on the highway or at a track day. If you're tired of that "falling on its face" feeling at 5,500 RPM, it might be time to look at some bigger options.
But before you go out and buy the biggest snail you can find, we need to talk about the reality of the EJ255 engine in your 2013 WRX. It's a great motor, but it has some "personality quirks," to put it politely. Upgrading the turbo isn't just about the turbo itself; it's about building a system that doesn't melt your pistons or leave you stranded on the side of the road.
The Supporting Mods (Don't Skip These)
I know, I know—everyone wants to spend their money on the shiny part that makes the "stututu" noises, but you can't just bolt on a bigger turbo and hope for the best. Your 2013 WRX is already pushing its fuel system pretty hard if you've got a basic downpipe and a tune.
First on the list is fuel. If you're going bigger than the stock turbo, you absolutely need larger injectors. Most people go with something like the Cobb/ID1050x injectors because they have great idle characteristics and plenty of headroom for most street builds. Pair those with a high-flow fuel pump, like a Walbro 255 or an AEM 340, and you'll actually have the gas needed to match all that extra air.
Then there's the intercooler. The stock top-mount intercooler (TMIC) on the 2013 WRX has plastic end tanks that like to pop off under high boost. Even if they stay together, they're not great at shedding heat once you start pushing 20+ PSI. You'll want to look into a beefier aftermarket TMIC or, if you're going for a really big build, a front-mount intercooler (FMIC). Just keep in mind that a front mount involves a lot more piping and can slightly increase lag.
Picking the Right Turbo for Your Goals
This is where the fun starts, but it's also where people usually mess up. You have to be honest with yourself: how do you actually drive the car? Is it your daily driver that needs to be zippy in traffic, or is it a weekend toy where you only care about top-speed pulls?
The Daily Driver Sweet Spot: 18G or 20G
If you want to keep that snappy, responsive feeling of the stock WRX but with a much higher ceiling, a Blouch 18G-XT or a 20G is usually the gold standard. These are "stock location" turbos, meaning they bolt right up without you having to hack up your engine bay.
The 18G is fantastic for a street car because it doesn't take forever to spool, but it will easily push you into the 330-350 wheel horsepower (WHP) range on pump gas. If you have access to E85, a 20G can get you close to 400 WHP, which is honestly the limit of what most people find "fun" before things start breaking constantly.
The Heavy Hitters: Dom 1.5XT-R and Beyond
If you're looking to embarrass some much more expensive cars, the Blouch Dominator series is usually the move. A Dom 1.5XT-R is widely considered one of the best all-around upgrades for the EJ platform. It uses a ball-bearing center section, so even though it's a bigger turbo, it still hits boost surprisingly fast. You're looking at serious power here—easily over 400 WHP with the right mods—but this is where you start approaching the "danger zone" for the stock internal engine components.
Internal vs. External Wastegates
When you're shopping for a 2013 WRX turbo upgrade, you'll often see the option for an internal wastegate (IWG) or an external wastegate (EWG).
Most turbos come with an internal one, which is simpler and quieter. However, the EJ engine often suffers from "boost creep," where the internal gate can't bleed off enough exhaust gas, and your boost levels climb uncontrollably. Switching to an external wastegate setup (which usually requires a specific up-pipe) gives you incredible boost control and that signature screaming sound when you hit full boost. It's loud, it's aggressive, and it's generally more reliable for high-performance setups.
The Tuning Factor
I cannot stress this enough: your 2013 WRX will not run with a new turbo without a custom tune. Don't even try to "limp it" to the shop on a Stage 2 off-the-shelf map. You'll need a Cobb Accessport and a reputable tuner who knows Subarus inside and out.
You have two main paths here: a Dyno tune or an E-tune. A Dyno tune is great because the tuner is right there with the car, and they can see exactly how it's reacting on the rollers. An E-tune is done remotely via data logs you send back and forth. Both are fine, but just make sure whoever you choose has a good track record with the GR chassis. A bad tune is the fastest way to turn your WRX into a very expensive driveway ornament.
Reality Check: The EJ255 Limits
We have to talk about the "glass" parts of the 2013 WRX. The 5-speed transmission in your car is better than the old "glass boxes" from the early 2000s, but it still isn't as bulletproof as the STI's 6-speed. If you're pushing 400+ lb-ft of torque and doing hard launches, that 5-speed might eventually decide it's had enough.
Then there are the ringlands. The factory pistons in the EJ255 are known to be a bit fragile when subjected to high heat and detonation. While a larger turbo can actually be "safer" in some ways because it's pushing cooler air than a maxed-out stock turbo, the sheer pressure of more power is always a risk. It's usually a good idea to have a "just in case" fund for a built short block if you're planning to go big.
Is It Worth It?
Honestly, doing a 2013 WRX turbo upgrade is one of the most rewarding things you can do if you love the platform. It transforms the car from a quick commuter into a legitimate performance machine. The way a properly set up 20G or Dom 1.5 pulls through third and fourth gear is something every Subaru enthusiast should experience at least once.
Just remember to do it right. Don't cut corners on the fuel system, don't ignore your maintenance, and definitely don't skip the professional tune. If you treat the car right and choose a turbo that matches your driving style, you'll fall in love with your WRX all over again. It's not just about the numbers on a dyno sheet; it's about how the car feels when you're merging onto the highway or carving up a back road.
At the end of the day, these cars were built to be messed with. The 2013 model year was one of the last of the "classic" widebody EJ feel before the FA engines took over in 2015. It's a special car, and giving it the power it should have had from the factory is a great way to keep it relevant against newer competition. Just be prepared—once you start down the path of bigger boost, it's hard to ever go back to stock.