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Ive got a DC sports manifold, de cat and cat back system, since ive had it its always sounded a very rattley on idle. Ive had people pull up next to me before and say that my car sound rough. I drives fine and sounds ok - its got oil in, and changed every 5K with Castrol 5w 40. Is this normal for a CTR with a manifold or is it worth changing the oil or anything else??