BMW B58 / S58 Billet Engine Oil Cap E43 you'll be removing the restriction

you'll be removing the restriction from the OEM converters which will reduce exhaust back-pressure and allow the exhaust from the turbochargers to flow more freely

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BMW B58 / S58 Billet Engine Oil Cap E43 you'll be removing the restrictionThe Precision Raceworks Billet Engine Oil Cap is a functional and stunningly stylish way to add a nice touch to any engine bay! This cap come in three color options so there is always a color that will work for you! Black with Billet, Black with Blue, and the Stealth series (all black). Many people don't realize it but the OEM caps have a pressure release valve built into them. Often times aftermarket companies don't know this either or just don't