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I do see one major flaw with this system though, and thats the fact that the design of their box will limit the effectiveness of the velocity stack. In order for that design to work properly the entire air box will have to remain at the same pressure(or vac to be more accurate), but having the filter on one side right next to the stack basically assures that that wont happen. At some point in the rev range the suction created by the motor will cause the filter to become a choke point, and when that happens the box wont be at a constant pressure and airflow will prioritize itself, which means that instead of drawing an equal amount of air around the entire stack it will be getting more from the side with the filter on it. An easy solution could be to add two smaller filter on eash side instead of a large one on one side, or using an elbow off of the bottom of the box for the filter if theres room.
Im not saying that it wont work or make power, just that it doesnt seem to be optimized for the entire rev range. I cant wait to see what it can do though.
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This is from a thread on another car forum (non-twins). Seems to make sense and i'm wondering what your thoughts on this are.