Not wanting to go with a header and sticking with OE manifold, what is the move to refresh everything? I don't want a loud exhaust. I think mine is going to give up the ghost soon and I want to replace everything back from the manifold at once. I do have to remove 2 sheered off heat shield bolts from the manifold... they sheered perfectly flush too... so I will either have to tack a bolt on to try and back the sheered ones out or drill and tap. Any conglomeration of off the rack components out there work well?