BMW S54 InjectorsPlease read our full writeup: Fuel Injector FAQs Severn Tuning recommend the following: 525cc Naturally aspirated applications on pump gas, flex fuel, or full E85; forced induction engines up to 400 whp on E85, or 520 whp on pump gas 650cc Forced induction engines up to 500 whp on E85, or 650 whp on pump gas Every injector is covered against failure caused by defects in original manufacture by our lifetime warranty. Applications up to 1000cc require
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