Remember that one time when you got your first turbocharged car? Turn the boost up they said, get a bigger turbo they said, itâs okay to run on pump gas they said. Well your rods will eventually disagree and stretch. The Manley H-Beam Rods have been forged from 4340, and have been heat treated, stress relieved, shot peened, and 100% individually mangafluxed to provide you the strength needed on your next high performance build.