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I have contacted @lussoperformance .. Turns out N63tu Engine-side catalytic converter part number matches N63tu2 downpipes. No. 18327645441
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2021 M5 Competition | Imola red
2020 Z4 M40i | Misano blue Pure850/PI/LPFP
Gone: 2018 M550i xDrive | DME Tuning BEF / JB4 / BM3 / DPs | 10.95 @ 125 1/4 Mile
Gone: 2014 335i xDrive | Bootmod3 Stage 2 93 Map | 12.2 @ 113 1/4 Mile
Last edited by Sheharyar_rr; 04-17-2018 at 02:58 PM..
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