flow that is as fast as each cylinder 39 s exhaust pulse this may permit equalization of egr 14 going to each cylinder 17 or adjustment of the egr 14 level for each cylinder as desired to provide stipulated amounts of exhaust gas to specific cylinders the total egr flow area may be large enough that significant flow can occur in a very short time and then in many cases the open window period may be less than the total pulse width valve 12 may be sufficiently fast to effect a very quick egr action controller 40 may provide or maintain a certain open window area to best utilize the pressure difference pulse the open window area for the flow control mechanism 12 may be of another valve type mechanism besides the rotating disks 43 and 44 an increase in engine back pressure may be accomplished by closing off or reducing momentarily the exhaust flow to the turbine with a use of a multiple flow path egr valve configuration which coordinates the opening and closing of the flow path possibly with another controllable valve type mechanism to the turbine 27 and or the egr valve 12 these events may be phased or timed with the egr valve 12 openings such that higher pressure pulses and thus an egr flow are obtained as needed the valve 12 areas of opening and timing may be controlled on a cylinder by cylinder basis to accomplish a customized egr flow for each exhaust pulse and to nominally equalize the egr flow with respect to each pulse each cylinder may have an individual pressure sensor not shown connected to controller 40 via a.