If you're looking to get a bit more growl out of your VB chassis, swapping out the stock 2023 wrx intermediate pipe is usually one of the first steps most owners take to wake up that FA24 engine. The new generation of the WRX is a fantastic car out of the box, but Subaru definitely played it safe with the exhaust note. It's quiet—too quiet for a car with a hood scoop and rally heritage. While a full cat-back exhaust is the go-to move for many, focusing on the intermediate pipe (often called the mid-pipe) is a smart way to customize your sound and airflow without necessarily breaking the bank or making the car unbearable for daily driving.
What exactly does the intermediate pipe do?
To understand why you'd want to change it, you have to look at the exhaust path. On the 2023 WRX, the exhaust gasses leave the turbo, head through the J-pipe (where the catalytic converters live), and then hit the intermediate pipe. This section of piping essentially bridges the gap between the front of the car and the rear Y-pipe that leads to your mufflers.
The factory 2023 wrx intermediate pipe is designed for the average driver. It's built to be restrictive enough to keep the cabin silent and ensure the car meets various noise regulations. It usually features a heavy resonator and some rather uninspiring bends that aren't exactly optimized for high-velocity airflow. When you swap it out for an aftermarket version, you're usually getting larger diameter tubing—typically 3 inches—and smoother mandrel bends that let the turbo breathe a little easier.
Sound: Resonated vs. Non-Resonated
This is the big debate in the Subaru community. When you start shopping for a new intermediate pipe, you'll notice two main flavors: resonated and non-resonated.
A resonated 2023 wrx intermediate pipe has a small chamber built into it that's designed to cancel out specific sound frequencies. Think of it as a "pre-muffler." If you want a deep, mature tone without the high-pitched rasp or interior drone, this is what you want. It keeps the "Subaru rumble" (even with equal length headers) sounding clean and sophisticated.
On the flip side, if you want your WRX to scream, go non-resonated. This is basically just a straight piece of pipe. It's louder, it's rawer, and you'll definitely hear more pops and crackles on downshifts. The downside? You might deal with some highway drone. If you've already deleted your mufflers and then add a non-resonated intermediate pipe, your neighbors are probably going to have a meeting about you.
Will it actually add horsepower?
Let's be real for a second: swapping just the intermediate pipe isn't going to turn your WRX into a 500-horsepower monster. On its own, the power gains are relatively modest. You might see a slight increase in throttle response and perhaps a few horsepower at the top end because you've reduced backpressure.
The real benefit comes when you pair it with other mods. If you have a high-flow J-pipe and a solid tune, that stock 2023 wrx intermediate pipe starts to look like a major bottleneck. By opening up that middle section, you're allowing the turbo to spool a bit faster. Most owners report that the car feels "zippier" in the mid-range, even if the dyno numbers aren't showing a massive leap. It's more about the quality of the power delivery and the overall driving experience than just a peak number.
Installation: Can you do it in your driveway?
One of the best things about working on the VB WRX is that it's still a relatively straightforward car for DIY enthusiasts. Replacing the intermediate pipe is a job you can definitely handle on a Saturday morning with some basic hand tools.
You'll need a set of jack stands (please don't work under a car supported only by a floor jack), a socket set, and probably some PB Blaster. Even on a newer car like the 2023 model, those exhaust bolts can get heat-cycled and stuck pretty quickly.
The process is pretty simple: 1. Unbolt the pipe from the J-pipe flange. 2. Disconnect it from the rear Y-pipe or muffler section. 3. Pop the pipe out of the rubber exhaust hangers. 4. Reverse the process with your new shiny stainless steel pipe.
Pro tip: Get yourself a pair of exhaust hanger pliers. They cost about twenty bucks and will save you from a lot of swearing and bruised knuckles. Those rubber hangers can be a total pain to slide off by hand.
Materials matter: 304 vs. 409 Stainless
When you're browsing for a 2023 wrx intermediate pipe, you'll see different grades of stainless steel mentioned. Most high-end aftermarket pipes use 304 stainless steel. This is the good stuff—it has a high chromium and nickel content, which makes it incredibly resistant to rust and corrosion. If you live in the "Salt Belt" where roads are treated in the winter, 304 is a must. It'll stay looking decent for years.
Then there's 409 stainless. It's cheaper and still much better than the aluminized steel used on older cars, but it will develop a layer of surface rust over time. It's functionally fine, but it won't stay pretty. If you're on a budget and don't care what the bottom of your car looks like, 409 is an option, but most WRX owners prefer to spend the extra bit for 304.
The "Drone" Factor
We need to talk about drone because it's the number one reason people end up selling their aftermarket exhaust parts on Marketplace two weeks after buying them. Drone is that annoying humming sound that fills the cabin when you're cruising at a steady RPM, usually around 3,000 RPM on the highway.
The stock 2023 wrx intermediate pipe is specifically engineered to kill drone. When you move to a wider, thinner-walled aftermarket pipe, you're inviting more vibration into the cabin. If your WRX is your daily driver and you spend an hour on the highway every day, I highly recommend looking for an intermediate pipe with a high-quality resonator. It preserves the "fun" sounds while filtering out the "headache" sounds.
Do you need a tune?
The short answer is no. You don't need a tune for just an intermediate pipe or a cat-back exhaust. The car's ECU is more than capable of adjusting for the slight change in backpressure. You won't trigger a Check Engine Light (CEL), and your air-fuel ratios will remain safe.
However, if you want to actually feel the difference, a tune always helps. But generally speaking, the intermediate pipe is considered a "bolt-on and go" modification. It's the J-pipe (the part with the cat) that requires a tune because it significantly changes how the turbo behaves. If you're just doing the mid-section and back, you're in the clear.
Final thoughts on the upgrade
Updating the 2023 wrx intermediate pipe is one of those mods that just makes sense. It bridges the gap between the engine's potential and the muted personality Subaru gave it at the factory. Whether you're going for a resonated pipe to keep things classy or a straight-through design to let everyone know you're coming, it's a tactile upgrade you'll notice every time you start the car.
Just remember to check your gaskets. A lot of people try to reuse the factory donut gasket or the flat gaskets, only to find they have a tiny exhaust leak that sounds like a cricket under the car. Spend the extra few dollars on fresh gaskets when you buy your pipe—it'll save you the hassle of having to crawl back under the car a week later. Happy modding!