im not sure if i could run the 3", i tried to measure the tubes on the cover and they came out to be around 2 3/4 inches. so would i need a reducer coupling for those or am i just measuring wrong. I also just wanted to use polish aluminum but maybe hoses just for in between the radiator. i also wanted to know do i have to use angled elbows because i noticed our stock tube has a few bends in it to get it lined up to the radiator vent.