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Funny mine is rattling now too I was just looking into these. the xs1259 looks good. stainless, fully welded, magnaflow knockoff. Big can like a flowmaster 50 series. $50
I currently have a dynomax straight thru muffler on mine. Its a bit louder than my old magnaflow but less droney at freeway speeds. Not sure how it would sound on the 4.3 though since I have a 5.7 But I'm much happier with it than the old muffler.