I know there has been discussions about the Ram Horn 2.5 inch Manifolds on 73-87 C10s, however I have seen mixed reviews. Has anyone ever successfully installed them (the 2.5 inch that go straight down, not the 2 inch that is angled) on a 2 WD truck? Mine is a 1985 chevy c10 longbed, 305 2WD. Thanks.