i know i started this post but after listening to the thing all day now i am starting to think its not coming from the engine itself but behind it, i am also noticing a slight vibration. any ideas? possibly catalytic or mount or something. here is what i notice, acceleration from a dead stop i hear it and it get loader and faster with more rpm's, but if i am cruising in 5 i don't hear it all and it quiets to almost nothing when sitting and idling.
