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Cat-Back Exhaust System for 2002-07 WRX/STI


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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

Was: $675.00
Sale: $607.50
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Single Tip, Cat-Back Exhaust

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.

4" Slash Cut Tip

An over-sized 4" slash cut exhaust tip adds an aggressive look to this impressive system. PERRIN exhaust tips are a brushed stainless steel, single wall construction and will not discolor with extreme heat.


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 repeatable joint with the ability to rotate each joining connection. This allows for easier installation and alignment adjustments for a perfect fit every time.

304SS Tubing

PERRIN Exhaust systems are made entirely of 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 the beautiful and long lasting finish and durability.

Sound Clip

It is very important to us for our exhaust to make power, but sound level and tone should also be a concern. Our system is designed to have a low and pleasing rumble while not producing the loud, rough drone that wakes your neighbors!
» Listen to the clip


Installed Photos

Click on the photo to the left to view a slideshow of this part and other like parts installed.


The PERRIN Exhaust systems come with a brushed stainless steel finish.

Lifetime Warranty

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


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Warranty Details

This product features a lifetime warranty Read Full Warranty

Tech Department




Product Weight 30 lbs.
Material 304 Stainless Steel


Sound Clip

In The Box

In The Box

(1) PERRIN single-tip muffler
(1) PERRIN mid-pipe
Necessary hardware included
(1) PERRIN License Plate Frame

Dyno Charts

Dyno Charts

Proven Horse Power

Dyno Chart

07 STI Catback Dyno Test

This test was done on an 07 STI that was running a stock ECU tune. We swapped out the exhaust in roughly five minutes and re-dynoed the car to find an additional 15WHP and 15ft-lbs of torque. So not only does this add a really cool tone but also power, all while increasing your fuel economy.

2.5L WRX Catback Test

This was done on our 08 WRX running a Stage 1 AccessPORT tune; this represents exactly what we see for WHP changes on all the WRX models. The 5-8WHP gains we see are typical on both the 2.5L and 2.0L WRX after installing our 3" cat-back exhaust.

Compatibility Notes


1993-2007 Impreza No
2002-2007 WRX Yes
2004-2007 STI Yes


Shipping Information

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