HardDrive Parts EFI 55mm SE Intake Manifold For Harley Milwaukee-Eight Dont let a restrictive stock intake bottle up your Harley M8. The HardDrive EFI Manifold uses a massive 55mm bore and smooth runners to feed your engine more air, more efficiently. Its a bolt-on power upgrade that translates to a noticeable jump in horsepower. Feel the difference the moment you twist the throttle! Features: OEM Style Replacement Manifold with smooth designed ports Cast aluminum construction Fits the stock throttle body Recommend replacing intake flanges and intake seals upon install (sold separately) Replaces OEM 27300167 Note: All models require ECM calibration with Screamin' Eagle Pro Street Tuner or dealership installed Screamin Eagle calibration for proper installation.