Out comes the old S52 manifold.
A lot of vacuum lines are hidden by the intake manifold. Thankfully the Turner Motorsport manifold adapter will clean all of this up.
The stock S52 Manifold runners (left) are said to be 30% smaller than the M50 intake manifold (right). This should really free up power higher in the RPM range.
I bought this manifold used for $50 off of bimmerforums.com where they typically sell for $50-100 used. Before installation, Barry grabbed the manifold and took it to the parts washer.
You can see years of oil blow-by buildup and gunk being washed out of the manifold. Thankfully Barry was adamant to go the extra length to clean the manifold before installing it despite it looking pretty good from the outside. This goes back to his racing background and ensuring everything is clean and properly evaluated which takes a little extra time but probably saved my motor from issues down the road since a piece of packing foam was lodged deep in a runner and could have been sucked into the motor. Let this be a lesson, be sure to clean your manifold!
We prepared our M50 manifold for installation with the Turner Motorsports manifold adapter. This kit includes everything that you need for the installation including new manifold gaskets, brackets, nuts, bolts, and a step by step installation directions with detailed photos. While there are less expensive kits out there, the high quality of this billet piece, requiring no additional hoses that would rip or kink, and the directions and support are well worth the price.
The M50 is now installed with everything else remaining stock. This should give us a good A-B comparison on the same day to see what difference the manifold alone makes.