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It is air to water and it's integrated into the intake manifold, so no conventional upgrade available. BMS was/is safely making 450 whp on their 340i with just JB4, intake and meth (stock exhaust) so I'm guessing the intercooler is stout as is.
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2017 M240i/ ZF8 Pure Drivetrain Solutions Stage 1 & torque converter/xHP/ DAW Ultra Flow/ DS2/ Nostrum injectors/ E40 Doug Newton tuned/ ER DP/ Remus axle back/ BMS intake/ FTP CP/ M Perf LSD
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