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Subaru WRX STI Mufflers

This page brings together exhaust mufflers for the Subaru WRX STI covering model years 2015–2021, including cat-back and OE replacement options across a range of styles and fitments. Select your year above and we'll show only the mufflers that fit your Subaru WRX STI. Fitment is checked against our vehicle data for every part listed.

1 - 4 of 4 results

Best Seller Free Shipping
Picture of AP Exhaust Muffler Welded Assembly

AP Exhaust Muffler Welded Assembly

66 reviews
Vehicle Specific
from $81
In Stock (10+)
Picture for manufacturer AP Exhaust
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Best Seller Free Shipping
Picture of AP Exhaust 7677 OE Replacement Muffler Assembly Aluminized Steel

AP Exhaust 7677 OE Replacement Muffler Assembly Aluminized Steel

66 reviews
Part: 7677
Vehicle Specific
$94.46
3 left at this price
Picture for manufacturer AP Exhaust
Best Seller Free Shipping
Picture of AP Exhaust 7017 Direct-Fit OE Replacement Exhaust Muffler Assembly

AP Exhaust 7017 Direct-Fit OE Replacement Exhaust Muffler Assembly

45 reviews
Part: 7017
Vehicle Specific
$113.78
2 left at this price
Picture for manufacturer AP Exhaust
Free Shipping
Picture of AP Exhaust 40163 Exhaust Muffler Assembly

AP Exhaust 40163 Exhaust Muffler Assembly

33 reviews
Part: 40163
Vehicle Specific
$182.36
1 left at this price
Picture for manufacturer AP Exhaust

What's here for your Subaru WRX STI

  • Exhaust mufflers in cat-back configurations
  • OE replacement exhaust mufflers

The widest selection here comes from AP Exhaust, Borla, HKS and MBRP, spanning both direct-fit replacement and cat-back styles suited to the Subaru WRX STI. Other categories Subaru WRX STI owners shop for: Subaru WRX STI Springs and Suspension Parts, Subaru WRX STI Shocks and Struts and Subaru WRX STI Manual Transmission Parts, or browse all Subaru WRX STI parts and accessories.