Just finished rebuilding mates '89 valver and fitted a 4-1 manifold bought off ebay. However, the manifold sounds really tinny, though it's not as bad once warm but still noticable.

When he initially brought the manifold too me i noticed it was really light, even compared to my miltek and had a resonator section. Could this be the reason for the tinny-ness?!? I told him it might be worth changing the manifold but has anyone else had this problem before i get lumbered into changin it?!
