Inlet duct. It helps pull in air further away from the engine. Pretty much useless with a cold air intake though, as it's not sealed against an airbox anymore
@@BigBensCarsAndCycles Thanks for the response. Silly mois thinking cold air would add more dense air.... boosting compression >>> more power . At my 69 years of age, and being slightly tone deaf, extra mufler/engine sound is not a goal or a priority