Cat-Back Exhaust Resonated System for 2011-18 WRX/STI Sedan


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WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

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The 2015-18 WRX exhaust is extremely quiet in stock form. Our resonated exhaust, although not much louder than stock, still provides 8-10 WHP and a much better sounding exhaust note compared to stock.

3.5" Slash Cut Tips

Over-sized 3.5" slash cut exhaust tips add an aggressive look to this impressive system. PERRIN exhaust tips sport a more heat-resistant brushed finish compared to the rest of the exhaust system and are of a single wall construction that will not discolor with extreme heat.

Straight Through Muffler

PERRIN mufflers have a true 3" internal diameter for uninterrupted exhaust flow. PERRIN mufflers and flange connections are 3" throughout the entire length, not necked down, for ultra smooth transitions throughout the system.

304SS 3" tubing

PERRIN Exhaust systems are made entirely of 3" Diameter 304 stainless steel. 304SS provides high corrosion resistance and is excellent for heat up to 1800 degrees Fahrenheit. Other manufactures may use cheaper 409 stainless steel which will rust and corrode over time, but the added expense of 304 stainless steel is well worth it for the beautiful, long lasting high brushed finish and durability.


PERRIN Exhaust systems feature high tech v-band clamps for a perfect exhaust connection. V-band clamps are designed to hold hundreds of pounds of pressure and do so without the need for a gasket! This connection allows for a precise and repeatable joint with the ability to rotate each joining connection. This makes installation much easier and alignment adjustments for a perfect fit every time.

Adjustable Y-Pipe

Our Y-pipe splitter features two slip joints which let you adjust muffler location and tip placement to perfectly sit in your bumper cutouts.


The PERRIN exhaust system comes in a brushed stainless steel finish.


It is very important to us for our exhaust to make power, but sound level and tone are also important concerns. Our system is designed to have a very mellow and pleasing note while not producing loud "farty" sounds that wake the neighborhood and produce a level noise that could be described as being antisocial.

Lifetime Warranty

PERRIN Performance warrants to the original purchaser, all PERRIN cat-back exhaust systems to be free from defects in material and workmanship. *Some exclusions apply
» Read Full Warranty

Off Road Use Only

This product is legal in California only for racing vehicles which may never be used upon a highway. Check your local and federal laws prior to installation.
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Warranty Details

This product features a lifetime warranty Read Full Warranty

Tech Department




Product Weight 52 lbs.
OEM Exhaust Weight 39 lbs.
Material 304 Stainless Steel

Compatibility Detail


2011-2014 WRX Sedan Yes
2015-2018 WRX Yes
2011-2014 STI Sedan Yes
2015-2018 STI Yes


2011 STI Sedan Exhaust

Sound Check


Dyno Charts

2008 STI Stock vs. with PERRIN 3" Catback

In The Box

In The Box

(2) PERRIN dual-tip mufflers
(1) PERRIN mid-pipe
(1) PERRIN y-pipe
All necessary hardware
(1) PERRIN License Plate Frame



Keep in mind, these tests are ONLY for comparison purposes to help provide an answer to the question "How loud is this?" PERRIN Performance cannot determine whether this or other exhaust systems will comply with any local law pertaining to a decibel limit for your car. If you are unsure of a system passing a local decibel limit law, please have a professional test your exhaust to determine its legality.


Shipping Information

  • Item Requires Shipping
  • 88.0 lbs.
  • W11.0000” x H25.0000” x L57.0000”
  • This item ships in its own box.

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