To take advantage of our new heads ability to accept an efficient tubular type manifold and to make use of the twin scroll turbine housing, we went with a Blackworks turbo manifold. The Blackworks manifold pairs cylinders 1-4 and 2-3 keeping the exhaust flows separate all the way up to the turbine exhaust housing. By using a twin scroll we can run a larger freer flowing .94 exhaust housing and still get reasonable spool. The Blackworks exhaust manifold is fabricated from thick schedule 40 stainless steel weld el. This tubing is normally used for steam pipes and is very heat and crack resistant.
The Blackworks manifold has a nice thick and warp resistant flange. We are somewhat reluctant to run a tubular manifold on something that might see long term use as they tend to crack, but this sturdy manifold should not have many problems.
We wanted an intake manifold with a larger plenum but didn’t think an all out fabricated plenum intake manifold was needed for our end use intentions. For our wide powerband and somewhat limited peak power ideas, we felt that a Skunk2 intake manifold would work well. The Skunk2 intake is a cast design that has a larger plenum and slightly shorter runners. This manifold is not the best for peak power but is a step above the stock manifold, especially for turbo use.
The shorter runners terminate in radiused openings leading into the larger plenum. These act like velocity stacks. The Skunk2 manifold should yield better top end power without hurting bottom end.
Skunk2 also provided these plastic thermal isolation intake manifold and throttle body gaskets. These have been proven to produce small but repeatable power gains by keeping the intake cool and thus the intake charge cooler.
We will be using DeatschWerks 1000cc top feed injectors to feed our turbo motor. These injectors are a direct drop in replacement for the stock injectors for an easy install. 1000cc injectors should give us more than enough capacity.