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I dropped in a BMC intake (FB929/20) and honestly you can't feel the gains. However, if you are running a high octane tune and pushing it, I think it would make an appreciable (if not noticeable) difference.
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2018 G30 540i xDrive M Sport | Carbon Black Metallic | KW V3 Coilovers | F90 Suspension | F90 Brakes | 20" HRE FF10 Liquid Black Wheels | Michelin Pilot Sport 4S Tires | Ivory White Dakota Leather | Carbon Fiber Trim | Executive Package | Bowers & Wilkins Diamond Surround Sound System | JL Audio 12W6v3 and XD600/1v2 | Ceramic Controls | BM3 Stage 2+ E50 ECU Tune | xHP Stage 3 TCU Tune | Dorch Stage 2 HPFP | MST Cold Air Intake | FTP Chargepipe | AA Catted Downpipe | Remus Catback Exhaust
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