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[QUOTE="Rich Rohrich, post: 703298, member: 16241"] On the early YZF 400s there was no useful airflow difference with the screen removed when measured on a flow bench through the complete intake system . The stock Yamaha airfilter flowed within a few cfm of the best air filter I tested (the TwinAir) . If I can get my hands on one of the new TwinAir setups I'll run the same tests on a CRF 450 . [/QUOTE]
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