Sensors 3 bar MAP sensor October 17, 2015 Jeffrey Jones I picked up a 3 bar MAP sensor in anticipation of installing a pair of BorgWarner K04’s. OEM vs 3 Bar Side-by-Side Some of the dimensions of the two: O-ring notch O-ring notch height OEM sensor: OEM Sensor O-ring width OEM and 3 bar side-by-side: S4 OEM and 3 Bar Related