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The only reason I can think of is weight savings. Every other after market exhaust kept the single to dual pipe design on the x3 exhaust.
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Cobb AP Stage 2+ | BMS DCI | UR Catless DP | UR Chargepipe | Tial BV 50mm | BSH OCC | ETS FMIC | Eisenmann Race Exhaust | KWv1 Coilovers | Volk TE37 TC Kline Ed. |