The tcfi kit includes the wego iiid dual channel wide-band exhaust gas oxygen interface that allows quick auto-tuning on a dyno or on-road during actual riding conditions.The kit includes bosch lsu 4.2 wide-band sensors for both front and rear cylinders.The tcfi solves tuning problems with highly modified engines.Competitive “band-aid” products that interface to the delphi® controller still rely on speed-density fuel control.Long duration/high overlap camshafts wreak havoc with manifold pressure - especially at idle and cruise rpm.Speed-density based fuel control simply can’t cope.