Picking out a new 2011 wrx exhaust is usually the first thing most owners do after they realize the stock muffler sounds like a sewing machine. Don't get me wrong, the 2011 model is a fantastic car—it's the first year the WRX got that sweet widebody look from the STI—but Subaru really choked the sound from the factory. If you want that classic horizontal-four rumble that makes people turn their heads, you're going to have to go aftermarket.
There's a lot to think about before you just buy the first shiny thing you see online. You've got to decide how loud you want to go, how much you want to spend, and whether you're looking for just sound or actual performance gains. It can get overwhelming pretty quickly, so let's break down what actually matters when you're looking to change things up.
Why the Stock Setup Just Doesn't Cut It
The factory 2011 wrx exhaust is designed to be quiet, neighbor-friendly, and compliant with all sorts of regulations. It's heavy, restrictive, and hides the best part of the EJ255 engine: the "Subie rumble." Because the 2011 WRX uses unequal length headers (UEL), the exhaust pulses reach the tailpipe at different times, creating that rhythmic, deep thumping sound.
When you swap to an aftermarket system, you aren't just making the car louder; you're letting the engine breathe. A less restrictive pipe allows the turbo to spool up a bit faster and lets the heat exit the system more efficiently. Plus, let's be honest, those tiny factory tips look a bit lost under the aggressive widebody rear bumper.
Choosing Between an Axle-back and a Cat-back
This is the first crossroad you'll hit. An axle-back exhaust is exactly what it sounds like—it's the part of the exhaust from the rear axle to the tips. It's basically just the mufflers. If you're on a budget or you're worried about making the car too loud for a daily driver, this is a solid route. It changes the tone and the look without messing with the mid-pipe.
On the other hand, a cat-back exhaust replaces everything from the catalytic converter back to the bumper. This is the most common choice for 2011 WRX owners. It replaces the resonated mid-pipe and the mufflers. This is where you get the most significant change in sound quality and a bit of a weight reduction. Most cat-backs use 3-inch piping, which is a nice upgrade over the narrower stock diameter.
Finding the Right Sound Profile
Sound is subjective, but in the Subaru world, we usually talk about three main categories: the "Daily Driver," the "Aggressive Growl," and the "Wake the Dead" loudness.
The Daily Driver (Refined and Deep)
If you use your car for work or take it on long highway trips, you want something that won't give you a headache. You're looking for a deep, bassy tone that stays quiet when you're cruising but opens up when you hit the gas. The Invidia Q300 is a legendary choice for the 2011 WRX for this exact reason. It has a larger muffler design that kills the highway drone but keeps that signature rumble. It sounds mature—like the car should have come from the factory.
The Aggressive Middle Ground
If the Q300 is too quiet for you, you might look at something like the Invidia R400 Gemini. It's a quad-tip system that's significantly louder than the Q300 but isn't as obnoxious as a straight pipe. It has a bit more "rasp" and "bark" to it. Another great option here is the Cobb Tuning cat-back. Cobb is known for having a very "clean" sound—it's crisp, deep, and looks very OEM+.
The Loud and Proud
Then there are the guys who want everyone within a three-block radius to know they're coming. The Tomei Expreme Ti is the king of this category. It's a single-exit, full titanium system. It's incredibly light, but because it's a single exit and made of thin titanium, it is loud. Like, "get a ticket in California" loud. But the sound is raw, mechanical, and sounds like a literal rally car.
Does the Sedan vs. Hatchback Matter?
Yes, and this is a huge point of confusion for people buying a 2011 wrx exhaust second-hand. The 2011 WRX came in both sedan and hatchback versions. While the engines and front halves of the cars are identical, the exhaust routing at the rear is different.
The hatchback has a much shorter rear section. If you try to put a sedan exhaust on a hatch, the tips will stick out way too far. If you try to put a hatch exhaust on a sedan, the tips will be tucked way back under the bumper and might actually melt your plastic trim. Always make sure the part number matches your specific body style.
The Quad-Tip vs. Single-Exit Debate
The 2011 WRX came with a quad-tip setup from the factory (two tips on each side). Most aftermarket exhausts, like those from Nameless Performance or GrimmSpeed, stick with this look because it fills out the bumper cutouts perfectly.
However, some enthusiasts prefer the "JDM style" single-exit look. This usually involves a large, angled canister muffler on one side, leaving the other bumper cutout empty. It's a polarizing look—people either love it or hate it. The benefit of a single exit is that it's almost always lighter because there's less piping and fewer mufflers.
Thinking About a Turbo-back?
If you're looking for actual horsepower gains, a cat-back isn't going to do much on its own besides sound cool. To really unlock power, you need a turbo-back exhaust. This includes replacing the downpipe (the part that connects directly to the turbo).
The stock downpipe has a very restrictive catalytic converter and a "flat plate" design that creates a lot of turbulence right at the turbo outlet. Replacing this with a high-flow catted or catless downpipe is the key to Stage 2 power levels.
A word of caution: If you install a downpipe as part of your 2011 wrx exhaust setup, you must tune the car. Running a downpipe without a proper ECU map (like a Cobb Accessport Stage 2 tune) will cause the car to run lean, boost creep, and eventually blow up your engine. Don't skip the tune.
Installation Tips and Potential Headaches
If you're planning on installing your new exhaust in your driveway, grab a can of PB Blaster or WD-40 Specialist and spray every bolt 24 hours before you start. Subarus are notorious for "exhaust rot" on the flange bolts, especially if you live in a place where they salt the roads in winter.
You'll also want to look at your exhaust hangers. The stock rubber hangers are often pretty soft, which can lead to your new, heavier exhaust tips jingling around or hitting the bumper. Upgrading to stiff polyurethane hangers (like those from Kartboy) is a cheap way to keep everything tucked up tight and centered.
Another common issue is the "donut gasket" where the mid-pipe meets the downpipe. If you're keeping the stock downpipe but putting on a 3-inch cat-back, you might need an adapter flange to prevent a persistent exhaust leak. There's nothing more annoying than spending $1,000 on a nice exhaust only to have it hiss every time you accelerate because of a bad seal.
Final Thoughts on the Upgrade
At the end of the day, a 2011 wrx exhaust is one of the most rewarding mods you can do. It changes the entire personality of the car. Every time you start it up in the morning or downshift coming into a corner, you'll hear that distinct boxer growl that makes these cars so special.
Whether you go for a subtle axle-back or a full-blown titanium single-exit, just make sure it fits your lifestyle. If you have a long commute, maybe skip the straight pipes. But if this is your weekend toy, let it scream. There's really no wrong way to do it as long as you're enjoying the drive.