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I recently put in a header and overpipe, with STOCK exhaust from there back. its louder than stock by a good amount. I might try that if I were you. Before you try anything with more volume, at least
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2020 BRZ Sport Tech RS World Rally Blue
'18 TS Suspension, camber bolts, align.
Gruppe-S UEL header/overpipe
Wayne Rom Stg 2+ tune
225/45VR17 RT660s
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