I agree with Tomsriv!! The B4B is the best all around street manifold you can put on a Buick. The performer ,although it positions the carb like the stock intake,loses HP over the B4B.A single plane intake makes Hp in the upper RPM range ,but it hurts street performance ,unless you,have a loose convertor or a wicked gear. All the info I have seen on ther Posten S-divider intake has been negative ,so I would steer clear of it.