Mercury - Cylindrical Air Filter OptiMax / Pro XS Series High-Flow Composite 880084T01. OverviewWhen you run a high-performance outboard, clean air is everything. It is the difference between a motor that breathes freely and one that feels choked the moment you push the throttle forward. The Mercury 880084T01 Cylindrical Air Filter is one of those parts you do not think much about-until you feel how smoothly your engine responds with a fresh one in place. Whether you are blasting across open wat