Well the gains are nothing major and its for more of a piece of mind for the p/s and alt at higher rpms

These won't blow up your engine but I would becareful about that underdrive crank pulley... I know a lot of people say they don't do any harm but Dinan the BMW tuner had a pretty good article on them and their ill effects...

Hope this answers your questions



3.0 14.392@97.237 2.302 60ft OEM 4-bolt LCA's $105 each Watch me go