| For example say The engine is flowing 600 cfm on one bank (lots of HP huh) and it is using the doolz with potmod too, and that flows about 498 cfm. Does this mean that since the engine is trying to flow 600cfm it can only flow 498 cfm because the intake is restricting it? No. Cause-Effect have to be in order here to understand this. If you are actually flowing 600CFM into one side of the engine, this is the total effect of all parts combined allowing 600CFM to enter one side of the engine. Consider looking at it this way: If you are flowing a total of 498CFM into the engine through one filter with the potmod, you would expect to see a vacuum of 10" at the filter. You CAN move more air into the engine though. The 498CFM rating is simply telling you the airflow value at 10" of vacuum (which is only about -0.3psi). You could flow 600CFM of air into the engine with a single filter, however, the filter is going to offer notably more resistance to flow. This means the turbos will have to work harder to move that 600CFM of air and there will be a greater vacuum at the filter than 10". Similar thing with the intercooler. The Sport-SMICs flow 236CFM at 1psi pressure drop. You can move more than 236CFM of air through them, but there will be a penalty of greater pressure drop. We are using a relative test pressure differential of 1psi for all intercooler testing, which is 28". We are using a relative test pressure differential of ~0.3psi for filter testing, which is 10". The reason for the difference in test pressure is due to the limitations of the flowbench. The flowbench simply cannot move enough air volume to create a 1psi pressure differential through a filter because they flow so much. The flow effects of the filters and intercoolers combine together though when looking at the system as a whole, but you can see through the flowtest data that their effects are different at different flowrates. Even though the filter can move some 498CFM at 10" which is a LOT higher than the flowrate of the intercooler, the effect of the filter still plays a significant role. This is mostly due to the fact that the turbocharger has to draw air through the filter and the better the filter flows, the less difficult it is for the turbocharger to move and pressurize the air, leading to better efficiency.
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