If your center is good now, get rid of the factory exhaust, it created heat in the center cylender, if you looked at the Y in the muffler you will see why, it´s sized down in the Y to about 1/2 inch, very poor design! Also the pipes are double layer most sized down to about 1 to 1 1/4 inch. Get rid of stock exhaust and the cooling steps up.
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