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T304 Muffler Delete - 2015-2021 Subaru WRX / STi


WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov

BLOX Racing's all-black and standard version muffler delete kits are made from T304 stainless steel and TIG-welded for durability and reliability against cracks and leaks. Each features OEM location hangers and includes new gaskets and hardware.

BLOX Racing Muffler Delete Kits replace the OEM mufflers and greatly reduce the bulk and weight associated with them. 

BLOX Racing matte black deletes are dual-exit, quad tip designs and provide the classic Boxer rumble with a more aggressive and throaty tone. 

Vehicle Applications

  • 2015-2021 Subaru WRX
  • 2015-2021 Subaru STi (non SPT)

T304 Muffler Delete Specs

  • 2.5” OD piping
  • 3.5" OD tips
  • T304 stainless steel
  • Mandrel-bent tubing; TIG-welded
  • Available in matte black or standard stainless steel finish

Features & Benefits

  • Dual muffler delete design, quad tips
  • Single wall construction
  • Direct bolt-on
  • Includes new hardware and gaskets
  • Replaces heavy and bulky OEM mufflers
  • Aggressive look
  • Throaty exhaust notes and tones 


  • Bolts to 2-hole exhaust flange
  • Will not work with aftermarket exhaust system
  • Does not fit SPT exhaust