sometimes when i'm at WOT my newly swapped coupe makes a sudden short lived noise similiar to a grind.. happens when i shift @ redline or do a high rpm dry rev.. it's not the tranny because i lifted my hood to look around and everytime i dry rev'd with the hood up it disappeared.. i checked to see if my hood was vibrating against something with grease and everything's alright? WTF could this be.. it wigs me out cause i feel like it's my motor grinding.

 

anyone