when i am in pretty much any gear when i get to 3750-4250 RPM the car will boost with a jerk instead of a smooth boost thru the whole gear... and if i have the RPMs fluxuating in between 3750 and 4250 the car with jerk with the fluxuating RPMs... i have a boost Greddy Profec B electronic boost controller with the ability to choose low or high boost and how much of either you give it... and an Apex'i S-AFC... I dont know much about either.. any help on the settings???