the vacuum/boost reference line does not need to be installed since maximum fuel pressure does not exceed 105psi

leading to a loss of power and potential engine damage

That allows precious coolant to flow into the radiator and start shedding heat sooner

the fuel rail can support all necessary engine power requirements

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BMW B48 Short Block Assembly Service F30 LCI the vacuum/boost reference line does5150 AutoSport Short Block Build Service for BMW B48 Engines Please note that price is based on customer providing core. If you need help sourcing a core, please contact our sales team. When your BMW engine needs to be built right the first time, 5150 AutoSports Short Block Assembly Service delivers the precision, consistency, and experience demanded by high performance BMW builds. This service is performed in house by BMW focused engine builders