As Eddie said easy enough to make a system. Could be designed to give best power improvements at a predetermined rpm. The maths is really not that difficult. I designed a set up for an sxv engine that had a restrictor in the inlet (racing regs). Designed around this to reduce the rpm of the power band due to the air flow becoming choked over 10,000rpm. Was matched with custom cams but principle is the same.
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James
2012 BMW 320d Sport
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