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I would like to replace the exhaust system on my 1998 Chev truck (V8) with a larger diameter pipe. I am told this could increase the MPG I am getting. I tow a 5th wheel. Has anyone else done this? If so, was it worth it? How much increase im MPG can one expect. With the price of gas now, a small increase of 2 MPG can save at least $1,500 per year, |