Thanks for the tip, I took the bolts off and the heatshield, i didnt have a chance to get new bolts today so I just put the heatshield back on with the old bolts, i tightened them down and the noise is gone, i know since we are running 4 cylinders small noises wont go away completely but at least that knocking noise is gone. thanks again, cant believe it was that simple.
No prob. Just make sure ur careful removing the old bolts. since they heat cycle alot, they are also notorious for snapping off in the manifold.