Cobb Catted Bellmouth Downpipe 3" WRX 02-07 / STI 04-07

Regular price $595.00

The Cobb 3" Catted Bellmouth Downpipe for the 2002-2007 WRX and 2004-2007 STI is CAD designed for factory like fitment and made of 304 stainless steel for enduring corrosion resistance and reduced heat transfer to the engine bay. 

The bellmouth design directs better flow of air coming out of the turbo and the cat has a much higher flow rate and longer lifespan due to 400 grade stainless steel.  

Cobb configured this downpipe with two O2 sensor bungs to accommodate the stock O2 or aftermarket sensors for connivence of installation.


  • CAD designed cast turbo outlet 
  • 304 Stainless Steel 
  • Custom spun metal substrate high flow cat
  • Two O2 bungs for factory & aftermarket sensors
  • Utilizes stock donut gasket 

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