u/Bulky-Education-5777

Hiii I just got this 68 cadillac Deville and I just wanted to know from sum people if I installed a duel exhaust and put a good intake if that would increase any mpg for my car or actually end up using more gas I’m mostly trying to see if I can get better gas mileage and potentially up my power a bit. If so would I need to tune my carb a little?