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Catback Exhaust - 2015-2018 WRX/STi

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Nameless Performance
98 product reviews
RRP: $968.00
$948.00 (You save $20.00)
Calculated at checkout

 Product Description

The 2015-2018 WRX & STi Catback from Nameless Performance follows a long line of exhaust R&D established by Nameless Performance over the last four years. Following closely in the footsteps of the '11-'14 WRX/STi Sedan Catback, with a number of improvements and changes to fit perfectly on your '15 WRX with the DIT engine or your '15 STi using the tried and true standard EJ series engine. In testing on the EJ series engine, this catback has shown midrange gains of +32ft lb of torque and +22hp at the wheels above and beyond a standard off-the-shelf Stage 1 tune. That standard is achieved through a number of innovative design cues that have made Nameless Performance the top name in Subaru aftermarket exhaust development and engineering.

The main functional elements of this catback exhaust are its matched flow dynamic from the 3" diameter resonated main circuit into the 2" diameter secondary circuits (the dual circuits of the rear of the exhaust). Starting from a goal of matching the flow of exhaust through the 3" section and into the 2" sections, the division of exhaust is accomplished with a larger diameter 2.25" Y section in the midpipe, which takes the position of highest friction in the catback exhaust and ensures a proper division of exhaust gas flow without inducing restriction. Many other companies go oversized on the rear circuits to accomplish this goal of keeping flow up in a divided exhaust, however, the overall midrange torque suffers and the horsepower is no higher than a system with a smaller terminal circuit diameter. Our system on the other hand, produces more torque through the midrange than most exhausts on the market, while retaining higher than average horsepower gains. The result is a catback exhaust that makes a substantial difference in the behavior of the vehicle.

The second major advantage to the 2" dual rear circuits on the exhaust is a substantial decrease in low frequency cabin noise at cruise, often referred to as 'exhaust drone.' While larger rear circuit exhausts produce low frequency tones at lower flow dynamics, resulting in a boomy sound at cruise and an overly loud raspy sound at wide open throttle, our system produces a substantial reduction in cabin resonance while retaining an aggressive tone at wide open throttle.

The system is designed using 100% T304 (low corrosion, high strength) stainless steel throughout. From the flanges to the tubing and hangers to the perforated tubing in the mufflers, all of the stainless we use is the highest grade T304. Muffler packing consists of medium density, high temperature resistant ceramic wool, ensuring long muffler life and a compact lightweight design that muffles better than many market standard mufflers that are 3-4x the size of our in-house fabricated and engineered mufflers.

All weld joints are hand TIG welded by skilled craftsmen in our shop in the Pacific Northwest. With over 40 years of experience in the welding industry, our team is comprised of fabricators who have worked in every industry from automotive to heavy industrial fabrication. They pride themselves on their work and produce results that are unparalleled in the industry. Each of the connections in the catback are attached with latch over v-band clamp assemblies where they are not connected at factory connection points. At the front, a conical flare joint with a floating flange and a proprietary 3" donut gasket connect the catback directly to a factory downpipe or an aftermarket downpipe with a connection that gives all of the compliance of the factory system and allows easy adjustment during installation. At the rear of the midpipe, factory fit flanges are used with a larger diameter bore than the factory system that can still use factory gaskets (which are larger than the factory exhaust system). Factory OEM Subaru gaskets and all hardware are included with the kit.



  • Muffler Delete: The loudest option. Removes the mufflers entirely. This is a 10 on a scale where stock = 0
  • 4" Mufflers: Similar to the deletes, but with the edge taken off. This is a 7 on a scale where stock = 0
  • 5" Mufflers: Our most quiet option. Perfect for those looking for a subtle upgrade. This is a 5 on a scale where stock = 0


  • 3" Double Wall: These are T304 stainless, staggered double wall polished tips that fit perfectly into the cutout in the rear valence of the vehicle. 10 Degree Angle Cut with staggered arrangement (inboard tips stick out 1/2" further than outboard tips). 3″ diameter per tip, very close to an OEM look
  • 3.5" Single Wall: Staggered ingle Wall Quad Tips in 3.5" diameter w/ 20 degree angle cut with a 1/2" staggered arrangement.
  • 3.5" Neochrome Single Wall: Same as above but with blue flame/burnt tips fit perfectly into the cutout in the rear valence of the vehicle. 3.5" tip with a 10 Degree Angle Cut with staggered arrangement (inboard tips stick out 1/2″ further than outboard tips).
  • 3.5" Double Wall: Staggered Double Wall 3.5" diameter quad tips, 1/2" staggered arrangement, straight cut, brushed finish.
  • 4" Double Wall: Staggered double wall 4" diameter quad tips, 1/2" staggered arrangement, 10 degree slash cut.

Installation Instructions:

Installation Guide - Axleback/Catback/Midpipe

Recommended Add-Ons:

Urethane Exhaust Hanger Bushings

Our urethane bushings hold your exhaust in place better that the factory rubber bushings and are highly recommended if you race your car or enjoy spirited driving. During hard cornering the exhaust "wags" left to right which sometimes causes the tips to touch the bumper. When this happens there is a chance your bumper can be damaged. The best way to avoid this is to use our urethane exhaust bushings to hold the exhaust in place.

  • 2 Bushings: Replace the two bushings at the rear of the car closest to the bumper. Recommend for those who either drive hard on the street or race occasionally at the track.

  • 4 Bushings: Replace all 4 rubber bushings on the axleback portion of the exhaust. Recommended for people who race their cars often.

  • 5 Bushings: Replace all 5 of the factory rubber bushings on a Catback from the midpipe back. Recommended for those who are hard core autocrossers or circuit racers.

 Product Reviews

Showing reviews 1-8 of 98 | Next

  1. '18 WRX Deep Sound!

    Posted by on

    Muffler delete, 4in tips. Out of all the catbacks for the fa20dit wrx this is the loudest option possible. I would HIGHLY reccomend this exhaust. With the deletes I was assuming the car would be raspy and high pitch but quite the opposite. Car sounds like a Subaru now. 5/5 worth it.

  2. Quality exhaust system

    Posted by on

    My installer told me that it was a quality system and went together nicely. Sound is so much better, even with the muffler delete, it is not to loud, nor is there any drone. Love it!!

  3. I Absolutely Love It!

    Posted by on

    Bought this for my 2018 STi Type RA and I couldn't be happier with it! Sounds a million times better than stock and better than any other (equally modded that is) exhaust I've come across yet. I can't say enough about NAmeless and thier quality of product.

  4. 4 inch tips are amazinngggg

    Posted by on

    I loved my 17 WRX, but the sound was just something I knew needed to be changed. The 4 inch mufflers just make it sooo much beater, so much meatier, and I felt a knew wave of love for my car flow through me as I started it up for the first time.

  5. Great stuff

    Posted by on

    I couldn’t have asked for a better exhaust system. Super easy to install I did have to adjust the midpipe as it was banging up against the heat shield but nothing I couldn’t take care of. Sounds amazing looks superb. I would definitely recommend this product without a doubt. I would tell anyone that’s getting this system to get the 4” tips as they look the best and to go ahead and order with the muffler deletes you can’t go wrong with these options.

  6. Best on the market

    Posted by on

    Was satisfied with the whole process. From support during ordering and install. The sounds is absolutely perfect. I couldn't be more pleased with the product!!

  7. Four inch tips look niiiiiiiiiice (and they sound even better)

    Posted by on

    After a couple helpful text chats, I placed my order for catback exhaust with four-inch, double-wall tips and five-inch muffles. It was shipped the same day and two pristine cardboard boxes arrived two days later.

    Upon opening, I could see everything was well-packed and accounted for. Install instructions were easy-to-find online (I had already read them five times before even ordering). Every bit of hardware was included. All the parts looked beautiful.

    A friend of mine has a lift so installation was a breeze. V-Band joints are the best. Urethane hangers are a fine choice. Everything lined up as expected. The tips filled the opening as if spec'd by the factory.

    Now for the best part: First fire-up. So I push the clutch, press the button, and this beautiful, mellow thunder shatters the stillness. My is friend standing in-front of the car and looking at me through the windshield. He's never heard any video and I never told him what it would sound like. His face absolutely lit up at this symphony of performance: "That sounds GUUUUUUUUUUUUUUD!"

    My drive home was brilliance. The next few days were spent giving people rides so they could hear and feel the sound. And I learned first-hand that everything written about the lack-of-droning is true. The car is quiet at idle, growls menacingly while accelerating, and quiets down again while cruising in 6th at about 70mph.

    My STI has always looked the part, had the performance to back up those looks, but now it also sounds the part.

    Goodness. I can't wait to install a Nameless downpipe and get a tune.

  8. 16 WRX STI, muffler delete, 4" tips, great quality, great sound, fast shipping

    Posted by on

    I have a 2016 Subaru WRX STI. Configuration ordered was the muffler delete and 4" tips.

    Sound: Sounds amazing. I was really torn between the muffler delete and the 4" muffler because I was worried that the muffler delete may be too loud. Nope! Sounds great! Not too loud with the delete. Plus, when just cruising, it is even a little quieter than I expected.

    Quality: Welds look great. Material is high quality. No complaints at all regarding quality.

    Install: I did the install with my brother. We are far from mechanics. Removing the stock system was super easy. Installing the new system was manageable. Don't get me wrong, putting it all together under the car is really straight forward, and the necessary hardware is all supplied. I am a bit of a perfectionist though, and therefore getting everything lined up perfectly was a bit of a b!#@%. In the end though, no leaks that I could hear or feel. Took about 15 minutes to remove the stock system. Took about an hour to get the new system on and lined up.

    Shipping: I had seen reviews that mentioned 5-6 weeks until they received their order. I chatted with someone who told me that turn around times were much improved and so I decided to ship FedEx ground. Granted, I live in the same state as the company, but I literally received my exhaust the very next day! Amazing!!!

    Overall very satisfied with my purchase. Wish they would have thrown a T-shirt in the box ;)

Showing reviews 1-8 of 98 | Next

 Product Videos

2015 Subaru WRX with Nameless Performance Catback Exhaust
  • 2015 Subaru WRX with Nameless Performance Catback Exhaust
    Resonator in mid-pipe with 5" short mufflers. 3" piping with 4...

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