I have a 1957 3100 series with a 235 6 cylinder, 4 speed transmission. I am thinking of installing a split manifold with dual exhaust and glasspack mufflers, also a dual 1 barrel carb set up. Looking to get better gas mileage a little better cruising speed on the highway and of course a real cool sound. Any input would be appreciated, pro's or con's, type of equipment good and not so good. Good idea - bad idea ? Enjoy your rides. Thanks_____Roller