hey i just ordered today my magnaflow muffler at my local muffler shop..it gets here tuesday and that day ill be putting in 2.5 inch piping all the way from the cat back till the magnaflow..i have one question though...one of my cats was removed..i have one cat and the other has a replacement tube.. but right now with the stock exhaust it gives off and rattling sound from right under where the cats are...they told me its cuz of the tube that once i replace the exhaust with the 2.5 inch piping and the magnaflow that sound should go away is this true? My cars a 1997 B5 2.8l v6 12v