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I think the rushing air sound is due to thinner-than-stock exhaust walls and getting rid of the heat shield.
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2013 Whiteout 6AT FR-S | Perrin Inlet Tube + 2.75" CAI | OpenFlash Header | P&L Catback | 4.88 Final Drive | Dialed in OFT 2.0x Stage 2 E85 | 18x8 Enkei Raijin + 225/40 Michelin Pilot Super Sport | 17x7 Stock + 215/45 Michelin X-Ice Xi-2
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