If you're chasing extra power for your SUBARU BRZ or TOYOTA 86, then replace the restrictive front pipe with this 60.5mm diameter stainless steel with smooth flowing bends and tig welds to optimise power output.
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Over pipe & Front pipe with Anti Drone Resonator for Subaru Brz / Toyota 86
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HKS STAINLESS DUAL RESONATED FRONT PIPE BRZ/86 – Boxer Performance Parts