DNA Stage 3 Double Race Air Filter Snorkel for Honda Grom / Monkey This S3 Honda Grom Race Air Filter from DNA offers an additional performance upgrade via a specially made two-winged snorkel with double 44mm hexagonal filters (included). The filtering efficiency is extremely high at 98-99% filtering efficiency (ISO 5011), with 4 layers of DNA Cotton.The flow of this DNA Stage 3 Honda Grom Racing Air Filter at 1,397 LTR/MIN is 103.70% more than the stock Honda airbox at 685.80 LTR/MIN @ 10mBar. Kit replaces the stock air box, no additional parts required, plug and play installation. FITS Honda Grom 125 (2014+) Honda Monkey 125 (2019+)