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It is 2am in the morning here and took the stock filter out ,do you know that it touches 2 sides of the airbox.NOT GOOD. But tinkering with the bits I have and the filter collar of a 06 450R will fit into the airbox duct allowing you to fit 250r filters, more space and probabley better airflow . I run 250r UNI filters on my 450r with outerwears and after3 houre they are clean, so I will run the same setup on my T-ReX700xx.:yay: