Hi All,
I have a 88 F350 Dually with a 460 gas.Am towing a fifth wheel. At the end of this season developed a exhaust manifold leak left bank. It was warped and had to replace that one. Right side went soon after but got that on a head sander and fixed that. Was told big blocks run hot and should redo exhaust system to 2.50 or 3 inch system. The present system is 2/14 inch with two cats and magna flows. Any suggestions on what I should put back on. Thank You