Exhaust› Exhaust Pipes, Systems and Components

Agency Power

3" Cat-Back Exhaust System

$700.00

SKU: AGPAP-GRBS-170S

In Stock
In Stock
Ships by Jul 29
Free Shipping
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The Agency Power 3" Catback Exhaust System is designed for the 2015-2021 Subaru WRX and 2015-2018 STI. It features all T304 stainless steel piping with a 3-inch diameter and robotic TIG welding. The system includes a resonator to maintain a boxer engine sound with an exotic tone while preventing cabin drone. The flanges are 1/2 inch thick for a secure fit, and the exhaust uses a high-flow Y-pipe to connect to dual canisters.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandAgency Power
Part NumberAGPAP-GRBS-170S
CategoryExhaust

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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