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Can I use an OEM STi exhaust on my WRX?

exhaust OEM sti wrx
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Can I use an OEM STi exhaust on my WRX?

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Yes, but do not use it thinking you now have an upgraded exhaust. While the piping is slightly larger in diameter, the catalytic converter is larger and more restrictive so any gains are negated. About the only reason to swap out components is to go to the STi axleback muffler which is slightly louder than the OEM WRX unit.

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