i read in another forum somewhere about a dude who now hears a "rattlesnake" sound in the engine after doing a mod like this, which is just like what i hear at lower rpm's. it usually goes away before i hit 2nd, sometimes 3rd, but i really only hear it when i jump on the gas. i can only hope that's what the open cone intake is supposed to sound like...
seems to make sense though, like the filter is gasping in air in shorter bursts which sound like a rattlesnake at first, which increases with the rpms & tapers off into a roaring suction sound when the airflow & rpms are higher... idk, never heard anything like it before i took the airbox out... i'm not sure about the rattle, but the rest of it sounds great
edit: i might have a bad seal... i twisted the cone a bit, which seemed to help some with the rattling, but it's not gone. i'm gonna need to add some silicone sealant between the base of the cone and the connecting flange.