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high-flow cat
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  1. Subaru BRZ Engine and Technical Discussion
    Invidia has just released two different front pipes for the BRZ and FR-S. One version comes with a high-flow catalytic converter (HFC), and the other is just a non-resonated straight pipe (or "test pipe") for all out performance. The high-flow cat version should net about a 6 whp gain, while the...
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