<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by JohnB.GWU.:
why does the tube's diameter decrease at the filter.
according to the commericals, is that really a precision engineered tube or bottle neck restriction to increase velocity or some bs? </div></BLOCKQUOTE>
This is where the mass air sensor is transplanted from the stock air box base to this area. The internal cross sectional areas have to be the same for proper air flow rate measurements.
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