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  1. 2015+ STI Discussion
    Part # 31021-AF024 Decided to just go with an axle back since I just wanted a better sound. This is listed as a WRX part on the HKS website and there isn't a sound clip on an STI. It's an HKS piece so there's not much that has to be said about quality and fitment. Each muffler weights about...
    31021-af024 hks
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