I seem to have picked up a vibration that seems to be getting worse. It started out as more of a feeling, but now I hear it as well. It occurs when I rev the engine, so I don't think it is suspension-related. I can see the spring on the Akra shake bad when I rev the engine. The engine mounting bolts are torqued to specs and none of the bolts holding the headers on seem to be loose. Any suggestions to check (known problem areas)? before I tear the damn thing down and tighten everything? Check my sig for mods. Thanks!