When I replaced my exhaust manifold about two months ago, the used replacement I got from ebay only had two bolts on it to secure the heat shield on (the other bolts were broken off into the manifold). Now I can't ger the shield to stop rattling. Would it be okay if I just removed the heat shield alltogether? I've got a cat-back exhaust, so the system should'nt be as hot as it was when it was stock.