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  • MBRP 11 - 21 WRX Sedan / STI Sedan Armor Pro Series Single Exit Catback w/ Polished Tip | S4803304 - JDMuscleCat Back Exhaust SystemmbrpS4803304
  • MBRP 11 - 21 WRX Sedan / STI Sedan Armor Pro Series Single Exit Catback w/ Polished Tip | S4803304 - JDMuscleCat Back Exhaust SystemmbrpS4803304
  • MBRP 11 - 21 WRX Sedan / STI Sedan Armor Pro Series Single Exit Catback w/ Polished Tip | S4803304 - JDMuscleCat Back Exhaust SystemmbrpS4803304
  • MBRP 11 - 21 WRX Sedan / STI Sedan Armor Pro Series Single Exit Catback w/ Polished Tip | S4803304 - JDMuscleCat Back Exhaust SystemmbrpS4803304
  • MBRP 11 - 21 WRX Sedan / STI Sedan Armor Pro Series Single Exit Catback w/ Polished Tip | S4803304 - JDMuscleCat Back Exhaust SystemmbrpS4803304
  • MBRP 11 - 21 WRX Sedan / STI Sedan Armor Pro Series Single Exit Catback w/ Polished Tip | S4803304 - JDMuscleCat Back Exhaust SystemmbrpS4803304
  • MBRP 11 - 21 WRX Sedan / STI Sedan Armor Pro Series Single Exit Catback w/ Polished Tip | S4803304 - JDMuscleCat Back Exhaust SystemmbrpS4803304
  • MBRP 11 - 21 WRX Sedan / STI Sedan Armor Pro Series Single Exit Catback w/ Polished Tip | S4803304 - JDMuscleCat Back Exhaust SystemmbrpS4803304

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3in Cat-Back Single Rear Exit w/ Polished Tip - Armor Pro T304

Fits: 11-21 WRX/STI Sedan

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Auto Parts Store of the Year 2026

MBRP 3in Cat-Back Single Rear Exit w/ Polished Tip - Armor Pro T304
Fits: 11-21 WRX/STI Sedan
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Fitment

Please Note: Fits 2011-2014 Subaru WRX and WRX STI Sedan (2.5L), and 2015-2021 Subaru WRX (2.0L) / WRX STI (2.5L). Part number S4803304. Single rear exit with polished tip.
  • 2008–2021 Subaru | WRX STI
  • 2011–2021 Subaru | WRX

Description

MBRP's Armor Pro Series 3-inch cat-back exhaust system for the 2011-2021 Subaru WRX and WRX STI Sedan. Constructed from T304 stainless steel with mandrel-bent tubing for maximum exhaust flow, it features a single rear exit with a mirror-polished stainless tip. The Street Profile tuning delivers an aggressive sound under throttle without being obnoxious on long drives.

  • Part number: S4803304
  • Armor Pro Series - T304 stainless steel construction, backed by a lifetime warranty
  • 3-inch mandrel-bent tubing, single rear exit
  • Mirror-polished stainless tip (single wall, angle cut)
  • Street Profile sound - aggressive under throttle, comfortable cruising
  • Bolt-on installation using OEM hangers, all hardware included

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